KLAWKKNI 2U Passive LGA 2011 Alternatives: 6 Similar Picks Compared

How the alternatives compare

TKJBHGPK 2U LGA 2011 Server Cooler

The TKJBHGPK model also targets LGA 2011 sockets in 2U server racks. It shares the passive cooling method and RGB lighting features found in the KLAWKKNI unit. The primary difference lies in the aesthetic design. The TKJBHGPK uses a square form factor rather than a narrow profile. This shape may impact fitment in tight chassis spaces where the KLAWKKNI’s narrow design excels. You should choose this alternative if you need a standard square heatsink for your build. It maintains the silent operation required for server environments. The lack of additional active components keeps the power draw at zero. This makes it a direct swap for users prioritizing silence over specific physical dimensions.

CTDOFUM 2U Narrow LGA3647 Active CPU Cooler

The CTDOFUM cooler targets LGA 3647 sockets instead of LGA 2011. It differs significantly by using an active cooling method with a built-in fan. This allows it to handle higher thermal loads than the passive KLAWKKNI unit. The design is extremely narrow, measuring just 0.39 inches in width and height. This compact size suits IT professionals managing high-wattage workloads in constrained 2U racks. You should pick this option if your processor exceeds the thermal limits of passive cooling. The active fan provides consistent heat dissipation regardless of case airflow. However, it introduces noise and power consumption. This makes it unsuitable for builds where absolute silence is the primary requirement.

KFXJMY AM4 AM5 Passive Copper Heatsink

The KFXJMY cooler is designed for AMD AM4 and AM5 sockets. It operates in 1U server spaces, which is half the height of the KLAWKKNI’s 2U form factor. It uses copper as the primary material for heat transfer. This passive heatsink suits AMD-based builds needing compact cooling solutions. You should choose this alternative if your system uses an AMD processor and requires a lower profile. The 1U height allows for more expansion slots or airflow paths. It lacks the LGA 2011 compatibility of the KLAWKKNI unit. The passive design ensures silent operation. This makes it ideal for quiet AMD server builds where space is at a premium.

KFXJMY 2U LGA4677 LGA4710 Active Cooler

The KFXJMY 2U Active Cooler supports LGA 4677 and LGA 4710 sockets. It uses an active cooling method with a fan, unlike the passive KLAWKKNI. This design suits users needing active cooling for specific server sockets in tight 2U spaces. The compact dimensions allow for installation in narrow chassis. You should pick this option if your system uses LGA 4677 or LGA 4710 processors. The active fan provides better thermal performance than passive designs. It handles higher heat output effectively. However, it introduces noise and power usage. This makes it less suitable for builds prioritizing silence. The active component ensures consistent cooling under heavy workloads.

Supermicro 2U Server CPU Cooler

The Supermicro cooler is a passive heatsink for legacy LGA 1155 and 1156 sockets. It operates in 2U server spaces, matching the KLAWKKNI’s height. The design is square, measuring 3.6 inches on each side. This unit suits users with older Xeon or Core processors. You should choose this alternative if your system uses legacy sockets. The passive design ensures silent operation. It relies on case airflow for cooling. The square shape may not fit narrow chassis as well as the KLAWKKNI. The weight is one pound. This makes it a sturdy option for older builds. It lacks modern socket compatibility but remains effective for legacy systems.

SilverStone 4U LGA 2011/2066 CPU Cooler

The SilverStone cooler supports LGA 2011 and LGA 2066 sockets. It uses a 4U form factor, which is twice the height of the KLAWKKNI. This larger size allows for robust heat dissipation in server workstations. The unit includes durable fan bearings for long-term use. You should pick this option if you have the physical space for a 4U heatsink. The larger surface area improves cooling performance. It suits users requiring durable components for heavy workloads. The 4U height limits its use in standard 2U racks. It is not suitable for space-constrained builds. The robust design ensures reliable operation in demanding environments.

Quick picks

Our 7 picks

1 Best overall

KLAWKKNI 2U Passive LGA 2011 Cooler

Best for: Silent LGA 2011 2U server builds

Socket Compatibility

LGA 2011

Lighting

RGB

System Type

Server

Color

Black

Server Height

2U

Cooling Method

Passive

View on Amazon: KLAWKKNI 2U Passive LGA 2011 Cooler Affiliate link

This KLAWKKNI heatsink is a passive cooling solution designed specifically for LGA 2011 sockets in 2U server chassis. It relies on case airflow rather than an included fan to dissipate heat. The unit features a black finish and includes RGB lighting elements, though it functions as a passive radiator. You should use this cooler if your server case provides strong front-to-back airflow and you need a low-profile replacement for standard LGA 2011 systems.

Pros

• Passive cooling design eliminates fan noise
• Compatible with LGA 2011 sockets
• Fits within 2U server height constraints
• Includes RGB lighting accents

Cons

• Requires strong case airflow to function
• No included fan for direct cooling
• RGB lighting adds minimal cooling value

Good fit if

• You need a silent server CPU cooler
• You have a 2U chassis with good airflow
• You are using an LGA 2011 processor

Skip if

• You need a cooler for LGA 1700 sockets
• Your case has poor airflow
• You require active fan cooling

Verdict: KLAWKKNI 2U Passive LGA 2011 Cooler is a specialized passive heatsink for LGA 2011 servers. It suits builds that prioritize silence and have adequate case airflow. It is not suitable for LGA 1700 or LGA 3647 systems.

2 Best budget

TKJBHGPK 2U LGA 2011 Server Cooler

Best for: 2U server builds with LGA 2011 CPUs

Socket Compatibility

LGA 2011

TDP Rating

110W

Lighting

RGB

System Type

Server

Server Height

2U

View on Amazon: TKJBHGPK 2U LGA 2011 Server Cooler Affiliate link

This is a 2U server heatsink designed for LGA 2011 sockets. It carries a 110W TDP rating, making it suitable for moderate loads in rack-mounted systems. The unit comes in a square color option and includes RGB lighting. It fits standard 2U chassis spaces. You should consider this if you need a passive-style radiator for a 110W processor in a server environment.

Pros

• 110W TDP rating for thermal management
• Compatible with LGA 2011 square sockets
• Includes RGB lighting features
• Fits standard 2U server chassis height

Cons

• Limited to 110W TDP, which is lower than some active alternatives
• Passive design requires case airflow to function
• Only supports LGA 2011 socket type

Good fit if

• You need a cooler for an LGA 2011 processor in a 2U server
• You want RGB lighting in your server build
• You have a case with strong airflow for passive cooling

Skip if

• You use a socket other than LGA 2011
• You need a cooler for a TDP higher than 110W
• You prefer a compact 1U height solution

Verdict: TKJBHGPK 2U LGA 2011 Server Cooler is a practical option for users needing a 110W-rated passive heatsink for LGA 2011 processors in 2U server racks.

3 Best fan

CTDOFUM 2U Narrow LGA3647 Active CPU Cooler

Best for: high TDP LGA3647 server builds

Socket Compatibility

LGA3647

Heat Pipes

4

TDP Rating

205W - 255W

Lighting

RGB

System Type

Server

Server Height

2U

View on Amazon: CTDOFUM 2U Narrow LGA3647 Active CPU Cooler Affiliate link

This is an active 2U server cooler designed for narrow LGA3647 sockets. It uses four copper heat pipes to handle a TDP rating between 205W and 255W. The unit includes a fan for active cooling. It is built for server environments where space is tight. You get a heatsink that fits standard 2U chassis constraints. It is a practical solution for high-wattage CPUs in narrow form factors.

Pros

• Supports LGA3647 narrow socket
• Four copper heat pipes
• Handles 205W to 255W TDP
• Includes fan for active cooling

Cons

• Limited to LGA3647 socket compatibility
• Only available as a heatsink without bracket in some options
• Specific 2U server form factor limits use cases

Good fit if

• You need a cooler for an LGA3647 server
• You require active cooling for high TDP CPUs
• You are building a 2U server chassis

Skip if

• You use a desktop LGA1700 socket
• You need a passive-only solution
• You require RGB lighting on the fan

Verdict: CTDOFUM LGA3647 2U Active Cooler is a specialized heatsink for narrow LGA3647 servers. It suits IT professionals managing high-wattage workloads in 2U racks.

4 Also great

KFXJMY AM4 AM5 Passive Copper Heatsink

Best for: 1U AMD server builds

Socket Compatibility

AM4, AM5

Cooler Height

0.39 inches

Lighting

RGB

System Type

Server

Color

Black

Server Height

1U

View on Amazon: KFXJMY AM4 AM5 Passive Copper Heatsink Affiliate link

This KFXJMY heatsink is a passive, 1U server cooler designed for AM4 and AM5 sockets. It uses copper fins for heat dissipation without fans. The unit is black and measures 0.39 inches in width, height, and length. It supports RGB lighting despite the passive design. You should consider this for narrow server chassis requiring low-profile cooling for AMD processors.

Pros

• Passive copper fin construction
• Compatible with AM4 and AM5 sockets
• Ultra-low 1U profile height
• Includes RGB lighting

Cons

• Passive design requires strong case airflow
• Small 0.39-inch dimensions limit surface area
• No fan included for active cooling

Good fit if

• You need a 1U low-profile cooler
• You use an AM4 or AM5 CPU
• You have high airflow in your server

Skip if

• You need active fan cooling
• You use an Intel LGA socket
• You require a larger heatsink

Verdict: KFXJMY 1U AM4/AM5 Passive Copper Cooler fits AMD-based 1U servers needing passive cooling. It suits builds with dedicated airflow paths for narrow AMD CPUs.

5 Best premium

KFXJMY 2U LGA4677 LGA4710 Active Cooler

Best for: LGA4677/LGA4710 2U active cooling

Socket Compatibility

LGA4677, LGA4710

Cooler Height

0.39 inches

Lighting

RGB

System Type

Server

Color

Black

Server Height

2U

View on Amazon: KFXJMY 2U LGA4677 LGA4710 Active Cooler Affiliate link

This active server heatsink supports LGA4677 and LGA4710 sockets. It maintains a low profile at 0.39 inches in height. The unit uses active cooling for LGA4677 and LGA4710 processors. It features a black finish. This cooler suits narrow server chassis requiring dedicated airflow. It provides a compact solution for specific workstation or server builds needing active thermal management.

Pros

• Active cooling method for efficient heat dissipation
• Compatible with LGA4677 and LGA4710 sockets
• Low profile design at 0.39 inches height
• Black color finish

Cons

• Limited socket compatibility to LGA4677 and LGA4710 only
• No RGB lighting despite listing attributes
• Very low height may restrict fan options

Good fit if

• You need a cooler for LGA4677 or LGA4710 sockets
• You require an active cooling solution for a 2U server chassis
• You need a low-profile heatsink under 0.4 inches

Skip if

• You use a socket other than LGA4677 or LGA4710
• You need a passive cooling solution
• You require RGB lighting effects

Verdict: KFXJMY 2U Active LGA4677 Cooler fits users needing active cooling for LGA4677 or LGA4710 sockets in tight 2U spaces. It offers a compact, low-profile design for specific server builds.

6 Also great

Supermicro 2U Server CPU Cooler

Best for: Quiet legacy 2U server builds

Socket Compatibility

LGA1156, LGA1155

Fan Speed

2800 RPM

Server Height

2U

Cooling Method

Passive

Dimensions

3.6 × 3.6 × 3.6 inches

Weight

1 pounds

View on Amazon: Supermicro 2U Server CPU Cooler Affiliate link

This Supermicro unit is a passive heatsink designed for 2U server chassis. It supports LGA1155 and LGA1155 sockets, covering Xeon 3400 and Core i3/i5/i7 processors. The design relies on case airflow rather than an integrated fan. It weighs one pound and measures 3.6 inches on all sides. You need a compatible server case to provide the necessary cooling air.

Pros

• Passive cooling design eliminates fan noise
• Supports LGA1155 and LGA1156 sockets
• Compatible with Xeon 3400 and Core i series
• Compact 3.6-inch cubic form factor

Cons

• Requires external case fans for operation
• Limited to older LGA 115x socket types
• Not suitable for high-TDP consumer CPUs

Good fit if

• You are building a quiet 2U server
• You use LGA1155 or LGA1156 processors
• You have strong case airflow

Skip if

• You need support for modern LGA sockets
• You want an integrated fan included
• You are cooling a high-power desktop CPU

Verdict: Supermicro 2U Passive LGA 1155/1156 CPU Cooler is a specialized heatsink for legacy server builds. It fits users who prioritize silence and have adequate chassis airflow for older Xeon or Core processors.

7 Best workstation

SilverStone 4U LGA 2011/2066 CPU Cooler

Best for: LGA 2011 workstation servers with 4U space

Socket Compatibility

Intel LGA 2011 / 2066 Square & Narrow

System Type

Server, Workstation

Dimensions

4.17 × 3.66 × 4.96 inches

Weight

1 pounds

View on Amazon: SilverStone 4U LGA 2011/2066 CPU Cooler Affiliate link

This SilverStone XE04 is a 4U active CPU cooler designed for Intel LGA 2011 and 2066 sockets. It uses five 6mm heat pipes and aluminum fins to move heat away from the processor. The unit includes a dual ball bearing fan controlled by PWM. It fits narrow and square socket layouts. You should choose this if you need reliable cooling for workstation servers that require a larger 4U form factor.

Pros

• Five 6mm heat pipes for efficient heat transfer
• Compatible with LGA 2011 and 2066 sockets
• Dual ball bearing fan for high reliability
• PWM controlled fan speed

Cons

• Requires 4U chassis space which is bulkier than 2U options
• Weight of 1 pound adds load to the motherboard
• Limited to Intel LGA 2011 and 2066 sockets

Good fit if

• You are building a workstation that supports 4U cooler height
• You need cooling for LGA 2011 or 2066 processors
• You prefer dual ball bearing fan longevity

Skip if

• You are limited to 2U server chassis height
• You use AMD or Intel sockets outside the 2011/2066 range
• You need a passive cooling solution without fans

Verdict: SilverStone XE04 4U LGA 2011 Cooler provides robust heat dissipation for server workstations using LGA 2011 or 2066 processors. It suits users who have the physical space for a 4U heatsink and require durable fan bearings.

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