7 Best Passive CPU Coolers, Compared

Quick picks

The best fit for you

• You need silent cooling for LGA1155 or 1156 CPUs Supermicro 2U Server CPU Cooler This 2U heatsink provides passive cooling for Xeon 3400 or Core i-series processors in workstations.
• You are building a low-profile LGA1700 server system ETURBEV 1U LGA 1700 Passive Cooler It features a vapor chamber and fits LGA1700 CPUs up to 180W in tight 1U spaces.
• You require a compact fanless solution for AMD AM4 or AM5 KFXJMY AM4 AM5 Passive Copper Heatsink This copper heatsink offers a specialized fanless design for AMD processors in low-profile server builds.

Our 7 picks

1 Best overall

Supermicro 2U Server CPU Cooler

Best for: 2U servers with LGA1155/1156 CPUs

Cooling Method

Passive (what this guide is about)

Socket Compatibility

LGA1156, LGA1155

Fan Speed

2800 RPM

Server Height

2U

Dimensions

3.6 × 3.6 × 3.6 inches

Weight

1 pounds

View on Amazon: Supermicro 2U Server CPU Cooler

This Supermicro heatsink is designed for 2U server environments. It uses a passive cooling method with a dedicated fan running at 2800 RPM. The unit supports LGA1155 and LGA1156 sockets, fitting Xeon 3400 and Core i3/i5/i7 processors. It weighs 1 pound and measures 3.6 inches on each side. You need this if you require reliable thermal management for older workstation CPUs without active airflow noise.

Pros

• Supports LGA1155 and LGA1156 sockets
• Passive cooling design reduces noise
• Compatible with Xeon 3400 series
• Fits 2U server chassis

Cons

• Limited to older LGA1155/1156 sockets
• No support for modern LGA1700 or AM5
• Fan speed is fixed at 2800 RPM

Good fit if

• You are building a 2U server
• You use LGA1155 or LGA1156 CPUs
• You need silent passive cooling

Skip if

• You use modern LGA1700 sockets
• You need active fan control
• You require AM5 compatibility

Verdict: Supermicro 1U Passive Server Heatsink fits 2U servers with LGA1155 or LGA1156 CPUs. It provides silent passive cooling for Xeon 3400 or Core i-series processors in workstation builds.

2 Best premium

Dynatron 2U LGA 4926 Server Cooler

Best for: Ampere Altra LGA 4926 2U server racks

Cooling Method

Passive (what this guide is about)

Socket Compatibility

LGA 4926

TDP Rating

250W

Fan Speed

11000 RPM

Server Height

2U

Dimensions

5 × 4 × 6 inches

View on Amazon: Dynatron 2U LGA 4926 Server Cooler

This Dynatron W1 cooler supports Ampere Altra processors in the LGA 4926 socket. It handles up to 250W TDP using aluminum fins, a copper base, and copper heatpipes. The unit measures 141.1 x 84.0 x 72.0mm. It includes pre-applied Shin-Etsu X23-8079-2 thermal paste. You should choose this if you need a 2U form factor for server racks. It fits systems requiring passive cooling for high-performance ARM-based CPUs.

Pros

• Supports 250W TDP for Ampere Altra processors
• LGA 4926 socket compatibility
• Copper base with copper heatpipes
• Pre-applied Shin-Etsu X23-8079-2 thermal paste

Cons

• 2U height requires specific rack space
• Only supports LGA 4926 socket
• Does not mention RGB lighting

Good fit if

• You use Ampere Altra processors in LGA 4926
• You need a 2U server cooling solution
• You require support for 250W TDP

Skip if

• You use Intel or AMD consumer sockets
• You need a 1U low-profile cooler
• You require RGB lighting effects

Verdict: Dynatron W1 LGA 4926 2U Cooler is a specialized server component for Ampere Altra systems. It fits data centers needing 2U passive cooling for 250W processors.

3 Also great

UOFKIPBA 1U LGA4677 Passive Heatsink

Best for: Silent LGA4677 server builds

Cooling Method

Passive (what this guide is about)

Socket Compatibility

LGA4677

System Type

Server, Workstation

Server Height

1U

View on Amazon: UOFKIPBA 1U LGA4677 Passive Heatsink

This is a 1U passive heatsink designed for LGA4677 sockets. It targets server and workstation environments where low profile and silent operation are priorities. The cooling method relies on airflow rather than active fans. It fits industrial computer systems. You get a dedicated radiator solution for high-performance workstations that require silent cooling without sacrificing the 1U form factor constraint.

Pros

• Passive cooling method for silent operation
• 1U server height for compact builds
• Compatible with LGA4677 socket
• Designed for server and workstation systems

Cons

• Passive design requires strong case airflow
• Limited to LGA4677 socket compatibility
• No active fan included for auxiliary cooling

Good fit if

• You need a silent cooling solution for an LGA4677 workstation
• You are building a 1U server chassis
• You require passive cooling for industrial computer applications

Skip if

• You use a socket other than LGA4677
• You need active fan cooling for high heat loads
• You are building a standard desktop PC instead of a server

Verdict: UOFKIPBA 1U LGA4677 Passive Heatsink is a specialized component for LGA4677 workstations requiring silent, low-profile cooling. It suits server builds that prioritize noise reduction over maximum thermal headroom.

4 Best budget

ETURBEV 1U LGA 1700 Passive Cooler

Best for: LGA1700 server systems with good airflow

Cooling Method

Passive (what this guide is about)

Socket Compatibility

LGA1700

TDP Rating

180W

System Type

Server

Server Height

1U

Features

Vapor Chamber

View on Amazon: ETURBEV 1U LGA 1700 Passive Cooler

This ETURBEV cooler is a 1U passive heatsink designed for LGA1700 sockets. It features a vapor chamber base to handle up to 180W TDP. The design suits server systems where space is tight. You get efficient heat transfer without fan noise. It is built for workstations and servers that need silent operation.

Pros

• Vapor chamber base for efficient heat transfer
• Supports up to 180W TDP
• 1U form factor fits tight server cases
• Compatible with LGA1700 sockets

Cons

• Passive design requires strong case airflow
• Limited to LGA1700 socket compatibility
• No fan included for active cooling

Good fit if

• You need a 1U heatsink for LGA1700
• You run a server with good airflow
• You want silent operation for 180W CPUs

Skip if

• You use a socket other than LGA1700
• You need active cooling for high heat loads
• You lack case airflow for passive cooling

Verdict: ETURBEV LGA1700 1U Passive Heatsink fits servers with strong airflow and LGA1700 CPUs up to 180W. It delivers silent cooling for tight 1U spaces.

5 Best lga 1200

ETURBEV 1U Passive LGA 1200 CPU Cooler

Best for: 1U server builds on LGA 1200

Cooling Method

Passive (what this guide is about)

Socket Compatibility

LGA1150, 1151, 1155, 1156, LGA1200

System Type

Server, Workstation

Server Height

1U

View on Amazon: ETURBEV 1U Passive LGA 1200 CPU Cooler

This ETURBEV unit is a passive heatsink built for compact 1U server and workstation chassis. It fits Intel LGA 1200, LGA 1150, LGA 1151, LGA 1155, and LGA 1156 processor sockets. Because it uses fanless passive cooling, you rely entirely on system airflow inside your rack. It suits you if you need a zero-noise heatsink for legacy Intel server builds.

Pros

• Fits slim 1U server and workstation rack enclosures
• Supports LGA 1200, LGA 1150, LGA 1151, LGA 1155, and LGA 1156 sockets
• Passive design has no moving parts or fan noise

Cons

• Omits mounting support for newer sockets such as LGA 1700
• Product specifications do not list a rated TDP capacity

Good fit if

• You deploy an Intel LGA 1200 or LGA 115x processor inside a 1U chassis.
• You rely on high-airflow chassis fans to move air across the motherboard.

Skip if

• You need mounting hardware for newer platforms such as LGA 1700 or AMD sockets.
• You build in an unventilated case that requires a direct-mounted CPU fan.

Verdict: ETURBEV 1U Passive LGA 1200 CPU Cooler fits system builders deploying LGA 1200 or LGA 115x processors into tight 1U rackmount enclosures.

6 Best lga 2011

KLAWKKNI 2U Passive LGA 2011 Cooler

Best for: 2U server chassis with LGA 2011

Cooling Method

Passive (what this guide is about)

Socket Compatibility

LGA 2011

Lighting

RGB

System Type

Server

Color

Black

Server Height

2U

View on Amazon: KLAWKKNI 2U Passive LGA 2011 Cooler

This is a 2U passive server heatsink designed for LGA 2011 sockets. It uses a radiator design to dissipate heat without fans. The unit is black and fits into 2U server chassis. It serves as a replacement for the SNK-P0048PS model. You need this if you are building a low-noise workstation. It relies on case airflow for cooling. It is not for standard desktop PCs.

Pros

• Passive cooling method for zero noise
• Compatible with LGA 2011 sockets
• Fits 2U server chassis standards
• Black radiator design

Cons

• Passive design requires strong case airflow
• Limited to LGA 2011 socket only
• Not suitable for standard desktop towers

Good fit if

• You are building a 2U server chassis
• You need silent operation for LGA 2011
• You require a passive heatsink replacement

Skip if

• You use a desktop motherboard
• You need active fan cooling
• You use a different socket type

Verdict: KLAWKKNI LGA 2011 Passive Server Cooler is a specialized passive heatsink for 2U server builds. It suits users who need silent LGA 2011 cooling in a server chassis.

7 Best am4

KFXJMY AM4 AM5 Passive Copper Heatsink

Best for: AM4/AM5 fanless server builds

Cooling Method

Passive (what this guide is about)

Socket Compatibility

AM4, AM5

Cooler Height

0.39 inches

Lighting

RGB

System Type

Server

Color

Black

View on Amazon: KFXJMY AM4 AM5 Passive Copper Heatsink

This KFXJMY cooler is a 1U passive heatsink designed for AM4 and AM5 sockets. It uses copper fins for heat dissipation without fans or active components. The unit is black and fits into server chassis requiring low-profile cooling. You need adequate case airflow to make it work. It suits users who need silent, fanless cooling for specific AMD desktop platforms in a server-style build.

Pros

• Passive cooling method for zero noise
• Compatible with AM4 and AM5 sockets
• Copper fin construction for efficient heat transfer
• Low 1U profile fits tight server cases

Cons

• No RGB lighting despite data listing
• Passive design requires strong case airflow
• Limited to specific AMD socket types

Good fit if

• You need silent, fanless cooling for AM4 or AM5
• You are building a low-profile server system
• You have strong case airflow for passive dissipation

Skip if

• You need active fan cooling for high TDP CPUs
• You require RGB lighting effects
• You use Intel LGA sockets

Verdict: KFXJMY AM4 AM5 Passive Copper Heatsink is a specialized fanless solution for AMD processors in low-profile server builds. It fits users who prioritize silence and have the airflow to support passive cooling.

Specifications side by side

Is Passive Cooling Worth It for Your Server Build?

Passive cooling removes fans entirely, eliminating mechanical noise. You get silent operation for server or workstation builds. This method relies on heatsink surface area and chassis airflow. Models like the ETURBEV LGA 1700 handle up to 180W with a vapor chamber. The KFXJMY AM5 uses copper for efficient heat transfer. You must ensure your rack provides strong air movement. Without active fans, heat dissipation depends on the environment. High-TDP desktop gaming is not suitable for these designs.

Worth it if

• You need zero noise in a 1U or 2U server rack
• Your chassis provides strong consistent airflow for heat dissipation
• You are running LGA 115x, 1700, or AM4/AM5 processors under 180W

Skip it if

• You require cooling for high-TDP desktop gaming CPUs
• Your server chassis has restricted or poor airflow
• You need to cool processors exceeding 180W without active fans

How We Selected These Coolers

We identified passive cooling methods by scanning Amazon listings for the specific cooling method attribute. Only products explicitly stating passive operation in their title or feature list were included. This ensures every item on the list relies solely on heatsink design rather than fans. We did not handle these units physically. All details come directly from published specifications.

The 7 products are ordered by availability first. Next, we applied a rating score weighted by review count. Finally, we ranked them by how many guide criteria their specs meet. This method prioritizes in-stock items with strong data support. We show only one variant per product family to keep the comparison clear and focused on your specific socket and server height needs.

How to choose the right one

1. Match socket compatibility

   You must verify the cooler fits your specific CPU socket before purchasing. The ETURBEV LGA 1700 model supports modern Intel processors, while the UOFKIPBA unit is designed for the LGA4677 socket. Using a cooler with an incompatible mounting bracket will prevent installation. Check the product attributes for socket compatibility to ensure the hardware matches your motherboard. This step is critical for server builds where swapping sockets is difficult.

2. Check server height

   Your rack chassis dictates the maximum cooler height you can install. Most options in this guide are either 1U or 2U. The Supermicro 2U Server CPU Cooler requires a 2U chassis, whereas the ETURBEV LGA 1200 fits into tight 1U spaces. Measuring your available vertical clearance is essential. Installing a 2U cooler in a 1U slot will block adjacent slots or prevent the chassis from closing. Always compare the cooler height against your server specifications.

3. Evaluate thermal design

   Passive coolers rely on surface area and heat transfer efficiency. The ETURBEV LGA 1700 features a vapor chamber, which helps move heat away from the CPU quickly. This design supports processors up to 180W in systems with good airflow. The KFXJMY AM5 heatsink uses copper material for high thermal conductivity. You should choose a model with advanced heat transfer features if your CPU generates significant heat. Airflow within the chassis remains the primary factor for passive cooling success.

4. Consider lighting needs

   Most server builds do not require aesthetic lighting, but some users may want it. The KLAWKKNI LGA 2011 cooler includes RGB lighting, which is unusual for a passive server heatsink. The KFXJMY AM5 model lists RGB attributes but specifies NO RGB in its size data, so you must verify the actual features. If you are building a standard data center rack, lighting is unnecessary. Check the attributes carefully to avoid paying for aesthetic features you do not need in a silent server environment.

5. Verify system type

   Ensure the cooler is designed for your specific system type. The UOFKIPBA LGA4677 heatsink is suitable for both server and workstation builds. The Dynatron W1 is specialized for Ampere Altra systems in data centers. Using a workstation cooler in a server rack may result in compatibility issues. Review the system type attribute to confirm the hardware matches your deployment. This distinction helps you find the right balance between noise reduction and thermal performance for your specific use case.

Frequently asked questions

See also

• best CPU coolers under 30
• best CPU coolers under 50
• best water coolers for home
• best NZXT aio liquid coolers