Looking Beyond the Thermalright SI-100 Low Profile ITX? 6 Alternatives Worth a Look

How each alternative compares

Noctua Chromax Dual Tower Heatsink Covers

This Noctua product is not a CPU cooler. It is a cosmetic cover for dual-tower heatsinks. It does not cool your processor. You should only consider this if you already own an NH-D15 or similar Noctua tower cooler. The SI-100 is a functional air cooler with heat pipes and a fan. This item is purely aesthetic. It changes the look of your existing hardware. It offers no thermal performance gain. It fits users who want a black finish for their dual-tower setup. It is irrelevant for ITX builds needing active cooling. The dimensions are large because it covers a full tower. It adds weight to your existing cooler. It does not replace the SI-100 for cooling needs.

Noctua Dual-Tower Heatsink Covers, Black

This Noctua NA-HC4 is a black heatsink cover, not a cooling device. It is designed for existing dual-tower coolers like the NH-D15. It provides a unified black aesthetic for your build. It does not generate airflow or remove heat from your CPU. The SI-100 is a complete low-profile cooling solution. This cover is an accessory for a different product category. It is suitable only if you have a large tower cooler and want to match a black theme. It has no fan or heat pipes. It adds minimal weight. It does not fit ITX cases due to its size. It is a visual upgrade for standard ATX or micro-ATX builds. It offers no cooling performance. It is distinct from the functional SI-100.

Noctua Dual-Tower White Heatsink Covers

This Noctua white heatsink cover is a cosmetic accessory for dual-tower coolers. It is not a CPU cooler. It fits existing Noctua models to provide a white finish. It does not cool your processor. The SI-100 is an active air cooler with a fan and heat pipes. This item is purely for aesthetics. It is for users who already have a large tower cooler. It does not fit in low-profile ITX cases. It has no thermal performance. It adds weight to your existing hardware. It is a visual upgrade for standard builds. It does not replace the SI-100. It is irrelevant for ITX builders needing compact cooling. It is a cover, not a cooler. It offers no airflow or heat dissipation capabilities.

AMD Wraith Prism RGB CPU Cooler

The AMD Wraith Prism is a low-profile cooler for AM4 sockets. It features RGB lighting and copper construction. It is smaller than the SI-100 in height but lacks heat pipes. The SI-100 uses six 6mm heat pipes for better heat transfer. The Wraith Prism is quieter for light tasks but has less cooling capacity. It is suitable for AM4 systems with RGB needs. It fits small cases well. The SI-100 supports more modern sockets like LGA 1700. The Wraith Prism is a step down in performance. It is a budget-friendly option for AM4. It lacks the versatility of the SI-100. It is best for users prioritizing aesthetics over raw cooling power.

Awxlumv 300mm Aluminum Passive Heatsink

The Awxlumv 300mm heatsink is a passive aluminum block. It has no fan or heat pipes. It is for passive cooling of power components, not CPUs. The SI-100 is an active cooler with a PWM fan. This item requires case airflow to work. It is larger than the SI-100 in length. It is suitable for transistors or ICs in well-ventilated cases. It does not fit CPU sockets. It is a specialized component for power management. The SI-100 is for general CPU cooling. This item is for passive thermal management. It lacks active cooling. It is not a CPU cooler alternative. It is for specific power component cooling needs. It is distinct from the SI-100's function.

ASHATA 1U Passive LGA 2011 Server Heatsink

The ASHATA 1U heatsink is a passive server component. It is for LGA 2011 sockets in 1U rack systems. It has no fan or heat pipes. It relies on server airflow. The SI-100 is an active air cooler with a fan. This item is for specialized server builds. It does not fit standard desktop cases. It is for Supermicro servers with LGA 2011. The SI-100 supports modern consumer sockets. This item is passive and lacks active cooling. It is not suitable for ITX desktops. It is for rack-mounted servers. It is distinct from the SI-100's consumer focus. It is a niche component for specific server hardware. It offers no active cooling performance.

Quick picks

Our 7 picks

1 Best overall

Thermalright SI-100 Low Profile CPU Cooler

Best for: quiet low-profile cooling in ITX cases

Material

aluminum

Compatible Device

CPU

Fan Size

120mm

Dimensions

120(L)x108(W)x100(H)mm

Mounting Type

metal fasteners

Socket Compatibility

AM4, AM5, LGA 1851, LGA 1200, LGA 1150, LGA 1151

View on Amazon: Thermalright SI-100 Low Profile CPU Cooler Affiliate link

The Thermalright SI-100 is a low-profile CPU air cooler designed for ITX builds. It stands 100mm tall and uses six 6mm heat pipes with AGHP 3.0 technology to manage heat effectively in tight spaces. The included 120mm PWM fan delivers up to 72.37 CFM of airflow while keeping noise levels at or below 27.7 dB. It supports both Intel and AMD sockets, making it a versatile option for small form factor systems.

Pros

• 100mm height fits most small computer cases
• Six 6mm heat pipes with AGHP 3.0 technology
• 120mm PWM fan provides up to 72.37 CFM airflow
• Supports Intel LGA 1700/1851 and AMD AM4/AM5 sockets
• Noise level stays at or below 27.7 dB

Cons

• Aluminum heatsink material limits heat dissipation compared to copper
• Single fan configuration offers less redundancy than dual-fan designs
• No ARGB lighting features included in this standard model

Good fit if

• You need a cooler under 100mm for an ITX case
• You want quiet operation with noise levels under 28 dB
• You use Intel or AMD processors requiring standard mounting

Skip if

• You require copper heat pipes for maximum cooling performance
• You need RGB lighting for your build aesthetics
• You have a case with height restrictions under 100mm

Verdict: Thermalright SI-100 100mm ITX Air Cooler fits ITX builders who need a compact, quiet cooler that supports modern Intel and AMD sockets without exceeding 100mm in height.

2 Also great

Noctua Chromax Dual Tower Heatsink Covers

Best for: customizing Noctua dual-tower cooler looks

Material

powder-coated aluminium

Compatible Device

Noctua NH-D15, NH-D15S

Dimensions

24.5 x 6.5 x 21.5 inches

Color

Black

Weight

12.3 ounces

View on Amazon: Noctua Chromax Dual Tower Heatsink Covers Affiliate link

This is an aesthetic add-on heatsink cover for Noctua dual-tower coolers. It is made from powder-coated aluminum and includes swappable inlays in six colors. The set fits two fin-stacks on NH-D15 or NH-D15S models. You get a 6-year warranty. It helps match your cooler with chromax line fans. It does not improve cooling performance.

Pros

• Powder-coated aluminum construction
• Six swappable inlay colors
• Fits NH-D15 and NH-D15S dual towers
• 6-year manufacturer warranty

Cons

• Does not improve thermal performance
• Requires existing dual-tower cooler
• Adds 12.3 ounces of weight

Good fit if

• You own a Noctua dual-tower cooler
• You want to match fan colors
• You prefer a solid aluminum build

Skip if

• You need better cooling
• You use a single-tower cooler
• You want a low-profile ITX cooler

Verdict: Noctua NA-HC3 chromax Swap Cover is a cosmetic upgrade for existing dual-tower coolers. You should buy it only if you want to customize the look of your NH-D15 or NH-D15S.

3 Also great

Noctua Dual-Tower Heatsink Covers, Black

Best for: customizing existing Noctua dual-tower coolers

Material

Powder-coated aluminium

Compatible Device

NH-D15, NH-D15S Series CPU Coolers

Dimensions

9.65 x 2.56 x 8.46 inches

Color

Black

Weight

12.3 ounces

View on Amazon: Noctua Dual-Tower Heatsink Covers, Black Affiliate link

This is an aesthetic add-on heatsink cover for Noctua NH-D15 and NH-D15S coolers. It is made from powder-coated aluminum and weighs 12.3 ounces. The dimensions are 9.65 inches in length, 8.46 inches in height, and 2.56 inches in width. It provides a sleek black look to match chromax fans. It suits users who want to customize the appearance of their existing dual-tower air cooler.

Pros

• Constructed from powder-coated aluminum
• Fits NH-D15 and NH-D15S dual tower heatsinks
• Includes two covers for both fin-stacks
• Provides a stealth black aesthetic

Cons

• Does not improve thermal performance
• Only fits specific Noctua dual-tower models
• Requires existing cooler to be installed

Good fit if

• You own a Noctua NH-D15 or NH-D15S cooler
• You want to match your cooler with chromax black fans
• You prefer a sleek, monochromatic build look

Skip if

• You need better cooling performance
• You use a cooler from another brand
• You are building a low-profile ITX system

Verdict: Noctua chromax Black Heatsink Cover is a cosmetic upgrade for owners of Noctua NH-D15 or NH-D15S coolers who want a unified black aesthetic. It does not help users who need more cooling power or have different cooler models.

4 Best white

Noctua Dual-Tower White Heatsink Covers

Best for: White aesthetic upgrades for Noctua dual tower coolers

Material

powder-coated aluminium

Compatible Device

Noctua NH-D15, NH-D15S

Dimensions

8.46 x 9.65 x 2.56 inches

Color

White

Weight

13.4 ounces

View on Amazon: Noctua Dual-Tower White Heatsink Covers Affiliate link

The Noctua NA-HC4 is a white aesthetic add-on heatsink cover. It is made from powder-coated aluminum and fits Noctua NH-D15, NH-D15S, and NH-D15S SE-AM4 dual tower coolers. The set includes two covers for both fin-stacks. Dimensions are 9.65 by 8.46 by 2.56 inches. It weighs 13.4 ounces. It suits users who want a clean white look for their air cooler.

Pros

• Powder-coated aluminum construction
• Fits NH-D15 and NH-D15S coolers
• Includes two covers for dual towers
• White chromax color

Cons

• Only an aesthetic cover, not a cooler
• Requires a compatible Noctua dual tower heatsink
• Does not improve thermal performance

Good fit if

• You own a Noctua dual tower air cooler
• You want a white aesthetic for your build
• You prefer powder-coated aluminum covers

Skip if

• You need a CPU cooler
• You use a single tower heatsink
• You want a cooler for ITX builds

Verdict: Noctua NA-HC4 White Heatsink Cover is a visual upgrade for existing Noctua dual tower coolers. It fits users who already have the hardware and want a white finish.

5 Best premium

AMD Wraith Prism RGB CPU Cooler

Best for: AM4 low-profile builds with RGB needs

Socket Compatibility

AM2/ AM3/ AM3+ / AM4

Material

Aluminum with copper core base

Compatible Device

Desktop

Dimensions

9.45"L x 27.17"W x 0.98"H

Lighting

RGB

Features

Fan

View on Amazon: AMD Wraith Prism RGB CPU Cooler Affiliate link

This AMD-branded cooler uses a copper base with aluminum fins and direct contact heat pipes. It supports AM2, AM3, AM3+, and AM4 sockets. The unit is 0.98 inches high, making it suitable for low-profile cases. It includes a fan with switchable profiles and RGB lighting. You get pre-applied thermal paste for easy installation. It is a solid option for AM4 builds needing a compact, aesthetic solution.

Pros

• Copper base with aluminum heat sink
• Direct contact heat pipes
• Supports AM2, AM3, AM3+, and AM4 sockets
• Low profile at 0.98 inches high
• Includes RGB lighting and switchable fan profile

Cons

• Single fan design limits airflow compared to dual-fan towers
• Copper base is not full copper construction
• Fan profile options are limited to switchable settings

Good fit if

• You need a cooler for an AM4 socket
• You are building a low-profile ITX case
• You want RGB lighting in your build

Skip if

• You require maximum cooling performance for heavy overclocking
• You prefer a full copper base for better heat transfer
• You are using an AM5 socket

Verdict: AMD Wraith Prism AM4 RGB Cooler is a compact, low-profile option with RGB lighting for AM4 systems. It fits well in small cases where height is restricted, though it may not match the cooling capacity of larger tower coolers.

6 Best budget

Awxlumv 300mm Aluminum Passive Heatsink

Best for: passive cooling of power components

Material

anodized aluminum

Cooling Method

passive cooling

Compatible Device

computer, Power Transistor, Fet, IC

Dimensions

300mm x 69mm x 36mm

Weight

1.63 pounds

View on Amazon: Awxlumv 300mm Aluminum Passive Heatsink Affiliate link

This is a large passive aluminum heatsink measuring 300 x 69 x 36 mm. It features 27 fins with a height of 31.4 mm and a base thickness of 4.6 mm. The anodized aluminum surface aids in heat transfer for components like power transistors and ICs. It suits you if you need a broad, low-profile cooling surface for high-power devices that rely on case airflow rather than direct fan attachment.

Pros

• 300mm length provides a large surface area for heat dissipation
• 27 fins increase the board area for greater heat transfer
• 4.6mm base board thickness offers structural stability
• Anodized aluminum finish provides a sleek silver look

Cons

• Passive cooling requires strong case airflow to be effective
• No included fan or mounting hardware for active cooling
• Not designed for direct CPU socket mounting

Good fit if

• You need a large surface area for power components
• You have a case with consistent airflow
• You are cooling transistors or voltage regulators

Skip if

• You need a fan to be included
• You are mounting directly to a CPU socket
• You require active cooling without case airflow

Verdict: Awxlumv 300mm Aluminum Heatsink is a passive cooling solution for power components. It fits you if you need extra surface area for transistors or ICs in a well-ventilated case.

7 Best server

ASHATA 1U Passive LGA 2011 Server Heatsink

Best for: Supermicro 1U server builds with LGA 2011

Socket Compatibility

LGA 2011 (socket R)

Material

Metal

Server Height

1U

Cooling Method

Passive

Compatible Device

Supermicro X9/X10 1U UP and DP servers

Dimensions

0.39 × 0.39 × 0.39 inches

View on Amazon: ASHATA 1U Passive LGA 2011 Server Heatsink Affiliate link

This ASHATA cooler is a passive 1U heat sink designed for server environments. It supports LGA 2011 sockets and fits Supermicro X9 and X10 systems. The unit relies on forced airflow from server fans rather than an included fan. It is built from durable metal materials. You should choose this if you need a low-profile solution for specific server hardware that lacks active cooling components.

Pros

• Passive cooling design for silent operation
• Fits 1U server chassis height constraints
• Compatible with LGA 2011 sockets
• Constructed from durable metal materials

Cons

• No included fan requires server airflow
• Limited to specific Supermicro server boards
• Not suitable for standard desktop PCs

Good fit if

• You are building a Supermicro X9 or X10 server
• You need a passive cooler for 1U rack space
• You use LGA 2011 processors in a server

Skip if

• You are building a standard desktop computer
• You need an included fan with the cooler
• You use a socket other than LGA 2011

Verdict: ASHATA 1U Passive CPU Heat Sink is a specialized component for Supermicro servers using LGA 2011 sockets. It fits only in 1U rack systems that provide their own airflow.

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