15 Best Passive Heatsinks, Compared
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
A passive heatsink uses system airflow or ambient convection to transfer thermal energy without moving parts. Matching thermal limits and physical dimensions to your enclosure is critical for stable performance. The Supermicro 1U Passive Server Heatsink leads because its 1U height and screw-and-spring mechanism directly secure LGA1366 Intel Xeon 5500 blade deployments.
We evaluated 15 products based on the specifications published on their listings. This review helps you determine the correct socket compatibility, cooler dimensions, and thermal design for your machine.
Quick picks
The best fit for you
- You run Intel Xeon 5500 hardware in 1U servers Supermicro 1U Passive Server Heatsink Its 1U profile and screw-and-spring mounting provide an exact fit for LGA1366 Xeon 5500 server deployments.
- You need silent cooling for a desktop CPU build Noctua Fanless Passive CPU Cooler Its 6.22-inch height delivers passive cooling designed for low-to-moderate-heat desktop processors relying on natural chassis convection.
- You want passive cooling for an M.2 2280 drive JEYI M.2 2280 Copper Fin SSD Cooler Its 0.47-inch height and 36 copper fins fit M.2 2280 drives needing silent thermal dissipation.
- You deploy AMD AM4 processors in 1U server racks Dynatron 1U AM4 Copper Passive Heatsink Its 1-inch height and pure copper construction match 1U rack deployments using AMD AM4 processors.
Our 15 picks
Supermicro 1U Passive Server Heatsink
Best for: 1U LGA1366 Xeon 5500 blade servers
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- LGA1366
- Server Height
- 1U
- Compatible Device
- 1U DP & 10-Blade Servers
- Dimensions
- 3.6 x 25 x 3.6 inches
- Mounting Type
- Screw & Spring
This Supermicro cooler is a passive heatsink engineered for 1U dual-processor and 10-blade servers. It is built strictly for the Intel LGA1366 socket and pairs with Xeon Processor 5500 Series CPUs. Fastening uses an integrated screw and spring mounting system to secure the 0.8-pound unit. You should choose this passive cooling unit if you run compatible rackmount chassis relying on directed chassis airflow.
Pros
- Screw and spring mounting method
- Designed for 1U DP and 10-blade server enclosures
- Engineered for Intel LGA1366 socket Xeon 5500 processors
- Passive zero-fan operation with 0.8-pound weight
Cons
- Restricted strictly to Intel socket LGA1366
- Hardware support limited to Xeon Processor 5500 Series
Good fit if
- You deploy an Intel Xeon 5500 Series CPU on socket LGA1366.
- You maintain 1U dual-processor or 10-blade server enclosures.
- You need screw and spring mounting hardware.
Skip if
- You use modern desktop sockets or AMD processor platforms.
- You require an integrated cooling fan on the heatsink.
Verdict: Supermicro 1U Passive LGA1366 Server Heatsink delivers a dedicated passive cooling solution designed specifically for Intel Xeon 5500 series hardware in 1U and blade environments. Its screw-and-spring mounting ensures a direct fit for LGA1366 enterprise deployments.
Supermicro 1U Passive Server Heatsink
Best for: LGA 1150 and 1155 1U server builds
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- LGA1150, LGA1155, LGA1156
- Server Height
- 1U
- Compatible Device
- X8, X9 1U UP Servers
- Dimensions
- 3.6 x 1.1 x 3.6 inches
- Mounting Type
- Screw Spring, Mounting Bracket
If you need a fanless cooling solution for legacy Intel server hardware, the Supermicro 1U Passive Server Heatsink is designed for 1U rackmount enclosures. It measures 3.6 inches long by 1.1 inches wide and weighs 0.5 pounds. The passive design relies on chassis airflow to cool LGA 1150, LGA 1155, or LGA 1156 processors. It suits your build if you run Intel Xeon X3400, E3-1200, or Core i3 CPUs.
Pros
- Fits compact 1U server chassis configurations
- Compatible with LGA 1150, LGA 1155, and LGA 1156 sockets
- Includes BKT-0028L mounting bracket and screw spring hardware
- Lightweight construction at 0.5 pounds
Cons
- Requires directed chassis airflow to cool effectively
- Limited strictly to select legacy Intel socket types
Good fit if
- You build or maintain a 1U server using X8 or X9 single-processor motherboards.
- You use an Intel Xeon X3400, E3-1200, or compatible Core i3 CPU.
- You have an LGA 1150, LGA 1155, or LGA 1156 motherboard socket.
Skip if
- You need a heatsink for AMD or newer Intel platforms.
- You operate a system without dedicated chassis fan airflow.
Verdict: Supermicro 1U Passive Server Heatsink delivers a dedicated 1U passive thermal solution for legacy Intel server platforms. It provides direct mounting compatibility for LGA 1150, LGA 1155, and LGA 1156 setups.
Supermicro 1U Passive Server CPU Heatsink
Best for: Socket F 1U blade server deployments
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- Socket G34, Socket F(1207 Pin)
- Server Height
- 1U
- Compatible Device
- 10-Blade Server
- Dimensions
- 3.94 x 1.02 x 3.54 inches
- Mounting Type
- Screw and Spring
This Supermicro 1U passive heatsink provides fanless thermal cooling for 10-blade server setups. It measures 3.94 inches long, 1.02 inches wide, and 3.54 inches high, weighing 0.9 pounds. Featuring screw and spring mounting, it is built specifically for Socket F 1207-pin layouts and handles Opteron 2000 and 8000 series processors. If you maintain compatible rack hardware and require a dedicated passive unit for high-density chassis, this cooler fits your enclosure constraints.
Pros
- Screw and spring mounting mechanism
- Compact 1U server profile
- Designed for 10-blade server enclosures
- Weighs 0.9 pounds
Cons
- Limited socket support to Socket F 1207-pin
- Restricted to Opteron 2000 and 8000 series processors
- Does not include an active fan
Good fit if
- You run a compatible 1U or 10-blade server system.
- You use a motherboard with Socket F 1207-pin mounting.
- You need a passive cooler secured with screws and springs.
Skip if
- You build with modern consumer desktop sockets.
- You require an active heatsink with a bundled fan.
- You run processors outside the Opteron 2000 or 8000 series.
Verdict: Supermicro 1U Passive Server Heatsink delivers passive thermal management specifically engineered for 10-blade server racks on Socket F platforms. Its screw-and-spring mechanism secures the 0.9-pound cooler firmly within tight 1U enclosure specifications.
Dynatron 1U Passive Vapor Chamber Heatsink
Best for: 1U LGA 2011 Narrow ILM servers
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- Narrow ILM Socket LGA2011
- Material
- Copper, Aluminum
- Server Height
- 1U
- Dimensions
- 5.2 x 2.4 x 4.5 inches
- Mounting Type
- Captive screw
This Dynatron passive heatsink is built for 1U server racks using Intel LGA 2011 processors with a Narrow ILM mounting pattern. It pairs a copper vapor chamber base with stacked aluminum fins to handle up to 165 watts TDP without an attached fan. Captive screws secure the block, and Shin-Etsu 7762 thermal grease comes pre-printed on the contact plate. It suits you if you run high-wattage rack hardware with dedicated chassis airflow.
Pros
- Copper vapor chamber base paired with stacked aluminum fins
- Dissipates heat for processors up to 165W TDP
- Pre-printed Shin-Etsu 7762 thermal grease
- Captive screw mounting system
- Low-profile 1U server form factor
Cons
- Limited strictly to LGA 2011 Narrow ILM sockets
- Requires high-airflow chassis fans to cool passively
Good fit if
- You need a 1U server heatsink rated for up to 165W TDP.
- You run an Intel LGA 2011 motherboard with a Narrow ILM layout.
- You want pre-applied thermal grease and captive mounting screws.
Skip if
- You use an AMD processor or a standard Square ILM Intel socket.
- You lack direct chassis fan airflow moving across the heatsink fins.
Verdict: Dynatron 1U Vapor Chamber Passive Heatsink delivers 165W thermal handling for dense 1U rack deployments using LGA 2011 Narrow ILM hardware. Its integrated vapor chamber maximizes heat transfer directly into server chassis airflow streams.
Supermicro 2U Passive LGA3647 Heatsink
Best for: Supermicro X11 Purley 2U server builds
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- Socket P lga-3647
- Server Height
- 2U
- Compatible Device
- Processor
- Dimensions
- 4.25 x 3.07 x 2.52 inches
- Weight
- 1 pounds
This Supermicro 2U Passive Server CPU Heatsink is a dedicated passive cooling block designed for server enclosures. It supports Socket P (LGA-3647) processors on the Supermicro X11 Purley platform. With dimensions of 4.25 inches long, 3.07 inches wide, and 2.52 inches high, this 1-pound heatsink fits standard 2U chassis clearances. You will find it suitable if you maintain rackmount hardware and rely on chassis fan airflow for CPU cooling.
Pros
- Fits 2U server chassis with a 2.52-inch height profile
- Direct compatibility with Socket P LGA-3647 processors
- Tailored for Supermicro X11 Purley platform hardware
- Passive design with a 1-pound heatsink weight
Cons
- Only compatible with Socket P LGA-3647, with no other socket support listed
- Requires a 2U or taller chassis, making it too tall for 1U servers
- Does not include an attached fan, requiring system airflow
Good fit if
- You run a server with a Socket P LGA-3647 processor on an X11 Purley board.
- You have at least 2U of vertical chassis space (2.52 inches of heatsink height).
- You rely on internal server chassis fans to push airflow over passive heatsinks.
Skip if
- You need a low-profile heatsink for a compact 1U rackmount chassis.
- You use standard desktop sockets or non-LGA-3647 server processors.
- You need an active heatsink with an integrated fan unit.
Verdict: Supermicro 2U Passive Server CPU Heatsink delivers a targeted passive cooling solution for LGA-3647 processors in 2U chassis environments. It gives you an exact fit for Supermicro X11 Purley platform deployments.
Dynatron 1U Passive Copper Heatsink
Best for: AMD EPYC Socket SP3 1U servers
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- SP3
- Material
- Copper 1100
- Server Height
- 1U
- Compatible Device
- AMD EPYC
- Dimensions
- 4.4 × 3 × 1 inches
This Dynatron cooler is a 1U passive heatsink designed specifically for AMD EPYC processors on Socket SP3. It measures 4.4 inches long, 3 inches wide, and 1 inch high, fitting directly into compact 1U server chassis. Built from Copper 1100 with skived fins, it weighs 1.3 pounds and comes with pre-applied Shin-Etsu 7762 thermal grease. It suits you if you need low-profile passive cooling for your SP3 rackmount build.
Pros
- Solid Copper 1100 construction with skived fins
- Compact 1-inch height designed for 1U server chassis
- Includes pre-printed Shin-Etsu 7762 thermal grease
- Tailored specifically for AMD EPYC Socket SP3
Cons
- Limited exclusively to Socket SP3 motherboards
- Lacks an integrated cooling fan
Good fit if
- You run an AMD EPYC processor on Socket SP3.
- You require a 1-inch heatsink for a 1U server chassis.
Skip if
- You use Intel processors or consumer AMD sockets.
- You need a heatsink that includes an attached cooling fan.
Verdict: Dynatron 1U Copper AMD SP3 Passive Heatsink delivers a compact 1-inch profile and solid Copper 1100 skived-fin construction for AMD EPYC servers. It provides a targeted passive solution for Socket SP3 with pre-applied Shin-Etsu 7762 thermal grease.
SilverStone 1U Passive Copper Server Heatsink
Best for: 1U Intel LGA 2011 and 2066 servers
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- LGA2011/2066
- Material
- Copper skived-fin and copper base
- Server Height
- 1U
- System Type
- Server
- Dimensions
- 3.54 × 3.54 × 1.02 inches
View on Amazon: SilverStone 1U Passive Copper Server Heatsink
The SilverStone 1U Copper Passive Heatsink is a server cooling block built for Intel LGA 2011 and LGA 2066 sockets. It measures 26mm (1.02 inches) in height with a 3.54 by 3.54-inch footprint, allowing it to fit into standard 1U rackmount enclosures. The unit uses an all-copper build featuring a copper base and copper skived fins, weighing 1.08 pounds. It suits your build if you run a rack server with dedicated chassis airflow.
Pros
- Low 26mm (1.02-inch) profile fits 1U rackmount chassis
- Full copper construction with skived fins and a copper base
- Compatible with Intel LGA 2011 and LGA 2066 sockets
- Dense 1.08-pound copper design provides substantial thermal mass
Cons
- Compatibility limited strictly to Intel LGA 2011 and LGA 2066 sockets
- Requires chassis ducting or system fans to provide airflow across the fins
Good fit if
- You need a low-profile heatsink under 27mm tall for a 1U rackmount server.
- You deploy hardware on an Intel LGA 2011 or LGA 2066 motherboard.
- You require an all-copper skived-fin thermal solution.
Skip if
- You use AMD platforms or newer Intel enterprise sockets.
- You operate a system without forced internal chassis airflow.
Verdict: SilverStone 1U Copper Passive Heatsink provides a compact, all-copper thermal solution tailored specifically for 1U servers running Intel LGA 2011 or LGA 2066 processors.
Noctua Fanless Passive CPU Cooler
Best for: silent low-to-moderate-heat desktop CPU builds
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- LGA1851, LGA1700, LGA1200, AM5, AM4
- Mounting Type
- Torx-based SecuFirm2+
- Dimensions
- 5.98 × 6.06 × 6.22 inches
- Weight
- 2.65 pounds
This Noctua passive heatsink delivers silent, fanless operation through natural convection. Measuring 6.22 inches tall, 6.06 inches wide, and weighing 2.65 pounds, it fits mainstream desktop sockets including Intel LGA1851 and AMD AM5. The design clears the top PCIe slot on most ATX motherboards and leaves 100% RAM clearance on select platforms. It suits you if you need zero-noise cooling for desktop processors with low to moderate heat dissipation.
Pros
- Torx-based SecuFirm2+ mounting for Intel LGA1851, LGA1700, LGA1200, LGA115x and AMD AM5, AM4
- 100% RAM clearance on AMD AM4 and Intel LGA1700 and LGA1200
- Includes second-generation NT-H2 thermal compound
- Supports completely fanless operation using natural convection
Cons
- Recommended only for CPUs with low to moderate heat dissipation
- Stands 6.22 inches tall and weighs 2.65 pounds
- Optional NF-A12x25 LS-PWM fan is not included
Good fit if
- You want completely silent CPU cooling without any moving parts.
- You use a supported Intel or AMD processor with low to moderate heat dissipation.
- You have a PC case that accommodates a 6.22-inch cooler height.
Skip if
- You use a high-heat processor exceeding low-to-moderate dissipation limits.
- You need a low-profile heatsink for a compact or 1U server chassis.
Verdict: Noctua Passive Fanless CPU Cooler provides dedicated silent cooling for low-to-moderate-heat desktop processors on current Intel and AMD sockets. Its 6.22-inch height and substantial footprint require a compatible chassis with room for natural convection.
VBESTLIFE 1U Passive LGA 2011 Heatsink
Best for: 1U server builds using LGA 2011
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- LGA 2011
- Server Height
- 1U
- Compatible Device
- Computer CPU, GPU
- Dimensions
- 0.39 × 0.39 × 0.39 inches
- Weight
- 7.94 ounces
This VBESTLIFE unit is a dedicated passive CPU heatsink designed specifically for Intel LGA 2011 sockets in 1U server chassis. It weighs roughly 0.50 pounds and relies entirely on external chassis airflow rather than an integrated fan. If you build or maintain a compact 1U rackmount system using the LGA 2011 platform, this cooler fits the form factor without occupying additional vertical rack units.
Pros
- Built for 1U server chassis height
- Dedicated Intel LGA 2011 socket compatibility
- Passive fanless operation eliminates moving parts
- Weighs 0.496 pounds
Cons
- Limited strictly to LGA 2011 sockets
- No integrated cooling fan included
- Requires active chassis airflow to cool hardware
Good fit if
- You need a heatsink that clears 1U server enclosure limits.
- You run an Intel LGA 2011 motherboard.
- You have active server chassis fans providing directed airflow.
Skip if
- You use an AMD socket or modern Intel desktop platform.
- You run a desktop case without dedicated duct airflow.
Verdict: VBESTLIFE 1U LGA 2011 Passive Heatsink provides a low-profile, fanless thermal solution tailored specifically for LGA 2011 server motherboards. It delivers zero-noise cooling provided your 1U chassis supplies sufficient directed airflow.
ASHATA 1U Passive LGA 2011 Server Heatsink
Best for: 1U Supermicro X9 and X10 servers
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- LGA 2011 (socket R)
- Material
- Metal
- Server Height
- 1U
- Compatible Device
- Supermicro X9/X10 1U UP and DP servers
- Dimensions
- 0.39 × 0.39 × 0.39 inches
The ASHATA 1U Passive Server Heatsink is a dedicated metal cooling block designed for server racks. Built specifically for 1U chassis, it supports Intel LGA 2011 (Socket R) processors across Supermicro X9 and X10 generation single-processor and dual-processor systems. If you run a rackmount chassis with dedicated chassis airflow, this passive unit fits your socket requirements while taking up 1U of vertical server space.
Pros
- Fits 1U server rack enclosures
- Compatible with Intel LGA 2011 (Socket R) sockets
- Supports Supermicro X9 and X10 1U UP and DP platforms
- All-metal construction for passive thermal transfer
Cons
- Socket support is limited strictly to LGA 2011
- Requires system chassis airflow to move heat away
Good fit if
- You maintain a 1U Supermicro X9 or X10 server setup.
- You need a fanless heatsink for an LGA 2011 socket.
Skip if
- You use modern consumer sockets like AM5 or LGA 1700.
- You need an integrated fan mounted directly to the heatsink.
Verdict: ASHATA 1U Passive Server Heatsink delivers a direct-fit passive cooling block for LGA 2011 processors in 1U Supermicro X9 and X10 chassis.
JEYI M.2 2280 Copper Fin SSD Cooler
Best for: fanless M.2 2280 NVMe SSD cooling
- Cooling Method
- Passive (what this guide is about)
- Material
- Copper, aluminum
- Compatible Device
- M.2 2280 NVMe SSD
- Dimensions
- 2.83 x 0.94 x 0.47 inches
- Weight
- 1.76 ounces
The JEYI M.2 2280 Copper Fin SSD Cooler is a passive heatsink designed for standard M.2 2280 NVMe solid-state drives. It uses a CNC aluminum frame paired with 36 copper fins rated at 401 W/m·K thermal conductivity. Measuring 0.47 inches tall and 2.83 inches long, it includes three thermal pads for drive contact. This suits you if you need silent solid-state storage cooling inside desktop PC cases with sufficient vertical clearance.
Pros
- 36 copper fins provide 401 W/m·K thermal conductivity
- Passive design operates without moving parts or fan noise
- CNC aluminum frame provides a rigid mounting structure
- Includes three thermal pads for installation
Cons
- Only compatible with M.2 2280 form factor drives
- Height of 0.47 inches requires vertical clearance above the motherboard slot
Good fit if
- You need silent passive cooling for an M.2 2280 NVMe SSD.
- You have at least 0.47 inches of vertical clearance above your M.2 slot.
Skip if
- You need a heatsink for a CPU or non-2280 storage drive.
- You have tight clearance beneath a graphics card or small chassis.
Verdict: JEYI M.2 2280 Copper Fin SSD Cooler provides silent heat dissipation for M.2 2280 drives using 36 copper fins and an aluminum frame. It is an effective passive thermal solution for desktops with 0.47 inches of slot clearance.
Bopaodao 120mm Flat Copper Heat Pipe
Best for: custom laptop and GPU passive cooling modifications
- Cooling Method
- Passive (what this guide is about)
- Material
- 99% pure copper
- Compatible Device
- Laptop, CPU, GPU, mobile phone
- Dimensions
- 2mm x 5.5mm x 120mm
This component is a single flat passive heat pipe built for custom thermal setups. It measures 120mm long, 5.5mm wide, and 2mm thick, utilizing 99 percent pure copper to move thermal energy away from chips. If you need to enhance cooling for a laptop, graphics card backplate, or compact DIY build, you can integrate this pipe directly into your existing heatsink assembly or contact points.
Pros
- Constructed from 99% pure copper
- Slim 2mm thickness fits tight spaces
- Passive design operates silently
- Compatible with laptops, GPUs, RAM, and CPUs
Cons
- Has dimensional tolerances of ±0.2mm thickness and ±0.5mm length
- Requires integration into an existing thermal system rather than mounting standalone
Good fit if
- You need a slim 2mm flat copper pipe to bridge clearance gaps in a laptop or GPU backplate.
- You are building a custom DIY passive thermal transfer setup.
Skip if
- You need a complete heatsink assembly with pre-drilled mounting brackets and fin stacks.
- You require zero-tolerance dimensions without the ±0.2mm thickness variance.
Verdict: Bopaodao 120mm Flat Copper Heat Pipe provides a slim, 99 percent pure copper thermal conductor suited for custom laptop and GPU cooling modifications. It serves as an add-on heat transfer element rather than a drop-in standalone heatsink.
Bopaodao 5mm x 90mm Copper Heat Pipe
Best for: custom low-profile hardware and backplate heat transfer
- Cooling Method
- Passive (what this guide is about)
- Material
- Copper, thermal fluid
- Compatible Device
- Laptop, PC, GPU, CPU, VRAM, RAM
- Dimensions
- 5mm x 90mm
This component is a standalone 5mm diameter, 90mm long copper heat pipe designed for passive heat transfer. It contains an internal thermal fluid to route thermal energy away from tight components like laptop ICs, RAM, or GPU backplates to a larger dissipation area. It suits you if you need a bare copper thermal tube for custom low-profile thermal routing or direct contact hardware modification rather than a ready-to-mount heatsink assembly.
Pros
- Copper construction with internal thermal fluid for heat transfer
- Compact 5mm diameter and 90mm length fits tight clearances
- Designated sharp end for heat source contact and smooth end for dissipation
- Compatible with laptops, GPUs, RAM, and LED modules
Cons
- Single bare pipe without integrated mounting brackets or thermal paste
- Requires a secondary radiator or backplate for effective heat dissipation
Good fit if
- You need a 5mm round copper pipe for custom thermal transfer.
- You are cooling compact hardware like laptop ICs, RAM, or a GPU backplate.
Skip if
- You need a complete CPU cooler with a pre-attached mounting system.
- You lack clearance for a 90mm straight tube or do not plan to shape it.
Verdict: Bopaodao 5mm x 90mm Copper Heat Pipe provides bare fluid-filled copper tubing for targeted heat dissipation on compact electronics. It serves custom thermal routing tasks where complete heatsinks cannot fit.
Dynatron 1U AM4 Copper Passive Heatsink
Best for: AMD AM4 builds in 1U server racks
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- AM4
- Material
- Copper
- Server Height
- 1U
- Dimensions
- 5 x 3 x 1 inches
- System Type
- Server
This is a passive copper server heatsink built specifically for AMD AM4 processors in rackmount systems. It measures 5 inches long, 3 inches wide, and 1 inch high to clear compact 1U chassis envelopes. If you manage rack enclosures requiring fanless cooling blocks over standard AM4 motherboards, this pure copper unit transfers heat straight into your server duct airflow.
Pros
- Full copper construction
- Compact 1-inch height for 1U chassis clearance
- Native AMD AM4 socket compatibility
- Completely passive with zero moving parts
Cons
- Compatible only with AMD AM4 sockets
- Requires high-airflow server chassis fans to operate
Good fit if
- You need a 1U-compatible heatsink for an AMD AM4 motherboard.
- You run a server chassis with dedicated duct airflow.
- You want a pure copper passive heatsink with a low 1-inch profile.
Skip if
- You use an Intel socket or a different AMD socket.
- You require an active heatsink with an attached fan.
Verdict: Dynatron AM4 1U Copper Passive Heatsink delivers a pure copper passive cooling solution engineered strictly for 1U server racks using AMD AM4 processors. It provides reliable low-profile thermal dissipation when paired with directed chassis airflow.
Dynatron 2U Passive AMD SP5 Cooler
Best for: AMD Genoa processors in 2U server chassis
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- Socket SP5
- Material
- Aluminum Fin + Copper embedded Base
- Server Height
- 2U
- Dimensions
- 118.0 x 92.4 x 64 mm
This Dynatron passive heatsink is engineered for 2U server chassis deployments. It pairs an embedded copper base and heat pipes with aluminum fins to dissipate up to 320 watts of thermal design power. Measuring 118.0 by 92.4 by 64 mm, it fits AMD Genoa processors on Socket SP5. If you manage high-density server racks with forced chassis airflow, this cooler handles demanding enterprise compute nodes without moving parts.
Pros
- Dissipates up to 320 watts of CPU thermal power
- Constructed with an embedded copper base, heat pipes, and aluminum fins
- Designed specifically for Socket SP5 AMD Genoa processors
- 64 mm height fits within 2U server enclosures
Cons
- Requires high-velocity chassis fans for passive operation
- Incompatible with desktop motherboard sockets
- Height exceeds standard 1U chassis clearances
Good fit if
- You deploy AMD Genoa enterprise processors on Socket SP5.
- You build or maintain 2U rackmount server chassis.
- You need passive heatsinks rated for up to 320 watts.
Skip if
- You build inside 1U low-profile server racks.
- You use consumer desktop sockets or standard PC cases.
Verdict: Dynatron 2U Socket SP5 Passive Cooler delivers 320 watts of thermal dissipation for AMD Genoa server deployments. Its 64 mm height integrates cleanly into 2U chassis using forced rack airflow.
Specifications side by side
| Spec | Supermicro 1U Passive Server Heatsink | Supermicro 1U Passive Server Heatsink | Supermicro 1U Passive Server CPU Heatsink | Dynatron 1U Passive Vapor Chamber Heatsink | Supermicro 2U Passive LGA3647 Heatsink | Dynatron 1U Passive Copper Heatsink | SilverStone 1U Passive Copper Server Heatsink | Noctua Fanless Passive CPU Cooler | VBESTLIFE 1U Passive LGA 2011 Heatsink | ASHATA 1U Passive LGA 2011 Server Heatsink | JEYI M.2 2280 Copper Fin SSD Cooler | Bopaodao 120mm Flat Copper Heat Pipe | Bopaodao 5mm x 90mm Copper Heat Pipe | Dynatron 1U AM4 Copper Passive Heatsink | Dynatron 2U Passive AMD SP5 Cooler |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Socket Compatibility | LGA1366 | LGA1150, LGA1155, LGA1156 | Socket G34, Socket F(1207 Pin) | Narrow ILM Socket LGA2011 | Socket P lga-3647 | SP3 | LGA2011/2066 | LGA1851, LGA1700, LGA1200, AM5, AM4 | LGA 2011 | LGA 2011 (socket R) | not specified | not specified | not specified | AM4 | Socket SP5 |
| Material | not specified | not specified | not specified | Copper, Aluminum | not specified | Copper 1100 | Copper skived-fin and copper base | not specified | not specified | Metal | Copper, aluminum | 99% pure copper | Copper, thermal fluid | Copper | Aluminum Fin + Copper embedded Base |
| Server Height | 1U | 1U | 1U | 1U | 2U | 1U | 1U | not specified | 1U | 1U | not specified | not specified | not specified | 1U | 2U |
| Cooling Method | Passive | Passive | Passive | Passive | Passive | Passive | Passive | Passive Fanless | Passive | Passive | Passive | Passive | Passive | Passive | Passive |
| Compatible Device | 1U DP & 10-Blade Servers | X8, X9 1U UP Servers | 10-Blade Server | not specified | Processor | AMD EPYC | not specified | not specified | Computer CPU, GPU | Supermicro X9/X10 1U UP and DP servers | M.2 2280 NVMe SSD | Laptop, CPU, GPU, mobile phone | Laptop, PC, GPU, CPU, VRAM, RAM | not specified | not specified |
| Dimensions | 3.6 x 25 x 3.6 inches | 3.6 x 1.1 x 3.6 inches | 3.94 x 1.02 x 3.54 inches | 5.2 x 2.4 x 4.5 inches | 4.25 x 3.07 x 2.52 inches | not specified | not specified | not specified | not specified | not specified | 2.83 x 0.94 x 0.47 inches | 2mm x 5.5mm x 120mm | 5mm x 90mm | 5 x 3 x 1 inches | 118.0 x 92.4 x 64 mm |
| Mounting Type | Screw & Spring | Screw Spring, Mounting Bracket | Screw and Spring | Captive screw | not specified | not specified | not specified | Torx-based SecuFirm2+ | not specified | not specified | not specified | not specified | not specified | not specified | not specified |
| System Type | not specified | not specified | not specified | not specified | not specified | not specified | Server | not specified | not specified | Server | not specified | not specified | not specified | Server | not specified |
| Features | not specified | not specified | not specified | Vapor Chamber | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified |
| Weight | 12.8 ounces | 8 ounces | 14.4 ounces | 7.94 ounces | 1 pounds | 1.3 pounds | 1.08 pounds | 2.65 pounds | 7.94 ounces | 7.69 ounces | 1.76 ounces | not specified | not specified | not specified | not specified |
| Model | SNK-P0037P | SNK-P0046P | SNK-P0042P | R31 | SNK-P0068PS | A25 | SST-XE01-2011 | NH-P1 | Vbestlife3gf50x7vz6152 | 753fmua7gc8nb360 | Q80 | not specified | not specified | A37 | not specified |
| Color | not specified | not specified | not specified | not specified | not specified | not specified | 1U LGA2011/2066 Passive | not specified | not specified | default | not specified | W: 5.5mm T: 2mm | L: 90mm | not specified | not specified |
| Size | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | L: 120mm | D: 5mm | not specified | not specified |
If your motherboard clearance requires drives with preinstalled thermal spreaders, you can review specifications for the best nvme SSDs with heatsink to evaluate physical dimensions.
How to Choose a Passive Heatsink
-
Examine Heatsink Construction Material
Check the metal composition before selecting a passive heatsink for your build. Solid copper construction offers rapid heat absorption, making it suitable for high-density server enclosures where chassis fans blow air across the fins. The SilverStone SST-XE01-2011 utilizes all-copper construction to maximize thermal conductivity in compact 1U chassis. Aluminum designs offer lighter overall weight but transfer heat at different rates. Review the material specification to confirm whether copper or aluminum best supports your cooling requirements. Always ensure your motherboard supports the weight of dense copper assemblies.
-
Verify Compatible Device Type
Heatsinks are engineered for specific components rather than generic hardware slots. You must match the cooler directly to the target hardware spec. The JEYI Q80 is designed strictly for M.2 2280 NVMe solid-state drives, utilizing thirty-six copper fins within a compact frame. It cannot mount to a processor socket. Similarly, CPU heatsinks will not mount to storage drives. Check the compatible device specification on the product listing to prevent clearance errors. Ensure your installation space provides the necessary vertical clearance above the storage slot before completing your setup.
-
Match Rack Unit Height
Server chassis require strict adherence to rack unit standards to close the chassis lid properly. A 1U server requires low-profile heatsinks that measure roughly one inch tall, whereas a 2U chassis accommodates taller fin arrays. For instance, the Dynatron 2U Passive AMD SP5 Cooler stands 2.52 inches tall, which is engineered specifically for 64 mm clearance in 2U chassis. It will not fit inside a 1U chassis. Always check the server height spec against your rack enclosure dimensions so you do not block internal chassis airflow baffles.
-
Check Rated Wattage Limits
Passive coolers depend on specific thermal design limits to operate without overheating your silicon. You must compare your processor thermal design power against the published wattage rating of the heatsink. For example, the Dynatron R31 specifies 165W thermal handling when exposed to directed server chassis airflow streams. If your processor exceeds this thermal capacity, the passive heatsink cannot shed heat fast enough. Always verify that your processor maximum power consumption stays below the cooler rated dissipation capacity. Never pair an unrated heatsink with high-wattage enterprise computing hardware.
-
Distinguish Heatsinks From Heat Pipes
You must distinguish between standalone heatsinks and supplemental thermal routing components. Complete heatsinks feature baseplates and fin stacks designed to transfer heat directly to the surrounding air. In contrast, products like the Bopaodao 120mm Flat Copper Heat Pipe are bare copper thermal conductors meant for custom modifications in laptops or graphics card backplates. They do not function as standalone CPU coolers. Check whether the listed product is a finished heatsink assembly or an add-on thermal transfer pipe before you purchase it for your cooling setup.
-
Check Pre-Applied Thermal Paste
Check whether the passive heatsink includes pre-applied thermal interface material or requires a separate compound. The Dynatron A25 comes equipped with pre-applied Shin-Etsu 7762 thermal grease on its copper base. Pre-applied grease speeds up server installation and guarantees uniform thermal contact across the processor lid. If a heatsink arrives with a bare metal base, you must supply your own thermal compound during installation. Review the packaging specifications to confirm if thermal paste is factory installed, ensuring you have the necessary supplies ready on assembly day.
Frequently asked questions
Can you run a passive server heatsink without chassis fans?
No, passive server heatsinks cannot operate safely without chassis fans because they lack integrated fans to move air. Enterprise models like the Dynatron Socket SP5 cooler handle up to 320 watts in 2U enclosures strictly by relying on forced rack airflow. True fanless convection cooling only works with specialized desktop designs like the Noctua NH-P1, which features a 6.22-inch height to promote natural airflow.
What is the thermal capacity of a 1U vapor chamber heatsink?
The Dynatron R31 1U passive heatsink provides a 165W thermal handling capacity for LGA 2011 Narrow ILM server hardware. An integrated vapor chamber spreads heat quickly across the baseplate into the cooling fins. This design transfers high thermal loads directly into directed chassis airflow, maintaining stable CPU temperatures in cramped 1U server enclosures without requiring a fan attached directly to the heatsink body.
How much vertical clearance does a passive M.2 SSD cooler require?
A passive M.2 SSD cooler like the JEYI Q80 requires 0.47 inches of vertical slot clearance above the motherboard. It measures 0.94 inches wide and 2.83 inches long, fitting standard M.2 2280 NVMe solid-state drives. The heatsink uses 36 copper fins set inside an aluminum frame to dissipate heat silently, provided your desktop case has clearance around adjacent PCIe expansion slots.
Can bare copper heat pipes serve as standalone heatsinks?
No, bare copper heat pipes are heat-transfer components rather than standalone heatsinks. Products like the Bopaodao 120mm flat heat pipe and 5mm round tubing consist of fluid-filled copper lines designed for custom modifications. You use them to route heat away from GPUs, laptops, or RAM toward larger radiators or metal plates, rather than using them as primary heat dissipation units by themselves.
Do passive server heatsinks come with pre-applied thermal paste?
Some passive server heatsinks include factory-applied compound, while others require separate paste. For example, the Dynatron A25 copper heatsink for AMD Socket SP3 comes with pre-applied Shin-Etsu 7762 thermal grease directly on the contact base. This allows direct installation onto AMD EPYC server chips without purchasing thermal paste separately, ensuring immediate and uniform thermal interface coverage across the processor surface.
What mounting system do 1U passive heatsinks use?
Most enterprise 1U heatsinks use screw-and-spring mounting mechanisms designed for direct attachment to server motherboards. Models like the Supermicro SNK-P0037P and SNK-P0042P use captive spring-loaded screws to maintain consistent contact pressure over the CPU. This secure fastening method keeps the heatsink aligned over sockets like LGA1366 or Socket F during shipping, rack vibration, and continuous multi-blade server operation.
Which AMD server sockets support passive cooling?
AMD EPYC processors on Socket SP3 and Socket SP5 platforms both support passive cooling inside fan-equipped server chassis. The Dynatron A25 offers a 1-inch-high copper heatsink built specifically for Socket SP3 1U servers. For newer platforms, Dynatron produces a 64 mm tall passive cooler designed for Socket SP5 AMD Genoa processors, capable of managing thermal loads up to 320 watts.