6 Best Alternatives to the MECCANIXITY 20x20mm 0.3mm Copper Shims (2026)

How the alternatives differ

MECCANIXITY 20x20mm 2mm Copper Shims

This MECCANIXITY option keeps the same 20x20mm footprint and copper material as the original, but it increases the thickness to 2mm. The original shim is only 0.3mm thick, making it suitable for tight gaps. The 2mm version fills much larger spaces between heatsinks and components. It retains the thermal conductive adhesive backing for easy installation on desktop GPUs. You should choose this if your hardware has a significant gap that the thin 0.3mm pad cannot bridge. The larger size also adds weight, which is negligible for most builds. It is not ideal for standard thin-spacer applications where precision is key.

PATIKIL 15x15x0.3mm Copper Heatsink Shims

The PATIKIL shim reduces the footprint from 20x20mm to 15x15mm while maintaining the 0.3mm thickness of the original. This smaller size is better for compact GPUs or laptops where space is limited. The original pad covers a larger area, which may be unnecessary for smaller chips. Both use copper for heat transfer. You should pick this PATIKIL version if your component is smaller than the 20x20mm area. It offers the same thin profile for precise gap filling. The reduced surface area means less material contact, which might slightly reduce heat spreading compared to the larger original pad. It is a practical choice for tight spaces.

PATIKIL 15x15x0.4mm Copper Heatsink Shims

This PATIKIL shim also uses a 15x15mm footprint but increases the thickness to 0.4mm. The original is 0.3mm thick. The slightly thicker design helps fill larger gaps than the original while still fitting smaller components. It is made of copper for effective thermal conductivity. You should select this if you need a bit more height than the original 0.3mm pad provides. The smaller 15x15mm size makes it suitable for compact setups. It is not a direct replacement for the original if you require the larger 20x20mm coverage. The 0.1mm difference in thickness is minor but relevant for precise thermal gap management on smaller chips or GPUs.

NEW Games Order PS3 Copper Heatsink Shims

This kit is designed specifically for PlayStation 3 repairs rather than general desktop GPU or CPU use. It includes copper shims and thermal paste to address overheating issues on PS3 models. The original MECCANIXITY shim is a standalone copper pad with adhesive, intended for custom desktop builds. This kit is a specialized solution for console repair. You should choose this only if you are fixing a PS3 with Yellow Light of Death issues. It is not suitable for desktop computer thermal management. The components are tailored for the specific thermal requirements of the PS3. It does not offer the versatility of the original shim for general-purpose gap filling in PC hardware.

JIUWU 15x15x0.8mm Copper Heatsink Shims

The JIUWU shim uses a 15x15mm footprint and increases the thickness to 0.8mm. The original is 0.3mm thick and 20x20mm. This option is better for laptops or GPUs with wider thermal gaps. The thicker copper pad provides more material for heat transfer in larger spaces. You should pick this if your hardware requires a 0.8mm spacer. It is not suitable for tight gaps where the original 0.3mm pad is needed. The smaller 15x15mm size fits compact components. It offers versatility for different gap sizes within the 15mm range. The increased thickness makes it a robust solution for thicker thermal interface requirements compared to the thin original shim.

JIUWU 20x20mm Copper Pad Shim

This JIUWU shim maintains the 20x20mm footprint of the original but increases the thickness to 0.8mm. The original is only 0.3mm thick. This thicker version is ideal for filling larger thermal gaps on desktop GPUs or chipsets. It provides more copper material for heat dissipation in wider spaces. You should choose this if you need a thicker spacer than the original 0.3mm pad offers. It retains the same width and length for compatibility with standard 20x20mm mounting areas. The increased thickness makes it less suitable for tight gaps. It is a practical alternative for systems that require more substantial thermal padding between components and heatsinks.

Quick picks

Our 7 picks

1 Best overall

MECCANIXITY 20x20mm 0.3mm Copper Shims

Best for: 20x20mm heatsink gap filling

Material

Copper

Compatible Device

Desktop Computer GPU CPU

Dimensions

20mm x 20mm, 0.3mm thickness

Mounting Type

Thermal Conductive Adhesive Tapes

Length

0.79 inches

Width

0.79 inches

View on Amazon: MECCANIXITY 20x20mm 0.3mm Copper Shims Affiliate link

This copper shim measures 20 by 20 millimeters with a 0.3 millimeter thickness. It uses thermal conductive adhesive tapes for mounting. The copper material withstands temperatures up to 160 degrees. You get five sets per package. This size fits desktop GPU and CPU gaps where a 0.3mm gap fill is required. It suits users needing precise height adjustment for heatsinks.

Pros

• 20x20mm dimensions provide a larger surface area than 15mm alternatives
• 0.3mm thickness matches specific heatsink clearance requirements
• Includes thermal conductive adhesive tapes for easy installation
• Copper material withstands high temperatures up to 160 degrees

Cons

• Copper surface darkens when exposed to air
• Only 0.3mm thickness is available in this specific listing
• Requires sanding if surface oxidation affects contact

Good fit if

• You need a 20x20mm shim size
• You require exactly 0.3mm thickness
• You want pre-applied adhesive tapes

Skip if

• You need 15x15mm dimensions
• You prefer non-copper materials
• You require thicknesses other than 0.3mm

Verdict: MECCANIXITY 20x20mm 0.3mm Copper Shim offers a larger footprint than the 15mm pads in this guide. It fits users who need precise 0.3mm spacing for desktop GPUs or CPUs with pre-applied adhesive backing.

2 Also great

MECCANIXITY 20x20mm 2mm Copper Shims

Best for: large gap thermal padding on desktop GPUs

Material

Copper

Compatible Device

Desktop computer GPU, CPU

Dimensions

20mm x 20mm x 2mm

Mounting Type

Thermal conductive adhesive tape

Weight

1.41 ounces

View on Amazon: MECCANIXITY 20x20mm 2mm Copper Shims Affiliate link

This MECCANIXITY copper shim measures 20x20mm with a 2mm thickness. It features a thermal conductive adhesive backing for direct mounting to desktop GPU or CPU components. The copper material handles temperatures up to 160 degrees. You get five sets per package. This thick pad suits builds needing significant gap filling, unlike the thinner 0.3mm alternatives on this list.

Pros

• 20x20mm copper construction
• 2mm thickness for large gaps
• Thermal conductive adhesive backing
• Withstands 160-degree heat
• Includes five sets per package

Cons

• 2mm thickness is too thick for standard 0.3mm gap requirements
• Copper surface darkens when exposed to air
• Requires sanding to restore surface appearance

Good fit if

• You need to fill a large 2mm gap between a heatsink and component
• You are cooling desktop GPU or CPU chips directly
• You require a self-adhesive copper pad for easy installation

Skip if

• You need the standard 0.3mm thickness for most CPU coolers
• You want to maintain a shiny copper appearance without maintenance
• You are looking for thinner shims like the 15x15mm options listed

Verdict: MECCANIXITY 20x20mm 2mm Copper Shim fills large thermal gaps with adhesive backing. It fits users needing thick copper padding for desktop GPUs or CPUs, rather than standard thin shim applications.

3 Also great

PATIKIL 15x15x0.3mm Copper Heatsink Shims

Best for: compact GPU and CPU gap filling

Material

Copper

Compatible Device

Laptop, Desktop Computer, GPU, CPU

Dimensions

15x15x0.3mm

Mounting Type

Adhesive

View on Amazon: PATIKIL 15x15x0.3mm Copper Heatsink Shims Affiliate link

This PATIKIL shim is a 15x15x0.3mm copper pad designed to bridge gaps between heat sources and cooling modules. The material offers reliable thermal conductivity to help reduce overheating risks. You get 12 pieces per package. It fits GPUs, CPUs, and laptop chips. This size is smaller than the 20x20mm standard, making it ideal for compact components or specific spacing needs.

Pros

• Made of pure copper for good thermal conductivity
• Includes 12 pieces per package
• Smooth surface with no burrs on edges
• Thin 0.3mm profile fills small gaps

Cons

• 15x15mm size is smaller than the 20x20mm standard
• Requires separate adhesive for installation
• Not suitable for large 20x20mm mounting areas

Good fit if

• You need shims for compact GPU or CPU areas
• You require a 0.3mm thickness for specific spacing
• You want a 12-piece pack for multiple components

Skip if

• You strictly need 20x20mm dimensions
• You prefer pre-adhesive pads
• You are cooling large chipset areas

Verdict: PATIKIL 15x15x0.3mm Copper Shim is a practical solution for small-gap thermal management. It suits builders working with compact GPUs or laptops where 15x15mm fits better than standard 20x20mm pads.

4 Also great

PATIKIL 15x15x0.4mm Copper Heatsink Shims

Best for: smaller 15x15mm GPU or CPU gaps

Material

Copper

Compatible Device

Laptop, Desktop Computer, GPU, CPU

Dimensions

15x15x0.4mm

Mounting Type

Adhesive

View on Amazon: PATIKIL 15x15x0.4mm Copper Heatsink Shims Affiliate link

This PATIKIL copper shim measures 15x15x0.4mm. It is made of pure copper for reliable thermal conductivity. The smooth surface has no burrs. You get six pieces per package. It fits GPUs, CPUs, and laptop chips. This size suits small components needing minor height adjustment. It helps fill gaps between heat sources and cooling modules.

Pros

• Pure copper material ensures good thermal conductivity
• Smooth surface with no burrs on the edges
• Includes 6 pieces in the package
• 0.4mm thickness fills small gaps effectively

Cons

• Smaller 15x15mm footprint than the 20x20mm standard
• 0.4mm thickness differs from the 0.3mm target
• Adhesive is not included in the package

Good fit if

• You need shims for smaller 15x15mm components
• You prefer copper over other metals
• You want a set of six pieces

Skip if

• You strictly require the 20x20mm size
• You need the exact 0.3mm thickness
• You want pre-applied adhesive for easy installation

Verdict: PATIKIL 15x15x0.4mm Copper Shim works well for smaller chips and GPUs. It offers solid copper construction for effective heat transfer. It is not suitable if you need the larger 20x20mm size.

5 Best premium

NEW Games Order PS3 Copper Heatsink Shims

Best for: PS3 overheating repairs

Material

100% copper

Compatible Device

Sony Playstation 3 PS3 Fat Slim

Dimensions

6.7 × 4.1 × 1.4 inches

Weight

1 pounds

View on Amazon: NEW Games Order PS3 Copper Heatsink Shims Affiliate link

This kit includes two 42x42mm copper shims and a 3.5g tube of Arctic Silver 5 thermal paste. The shims are 1.2mm thick and made of 100% copper. They are designed for Sony PlayStation 3 Fat and Slim models. You use them between the CPU or GPU and the heatsink. This setup helps improve cooling performance for these specific consoles.

Pros

• Includes 42x42mm copper shims
• Shims are 1.2mm thick
• Contains 3.5g Arctic Silver 5 paste
• 100% pure copper material

Cons

• Limited to PS3 consoles only
• Shims are larger than standard PC shims
• No warranty information provided

Good fit if

• You own a PS3 Fat or Slim
• You need to fix YLOD issues
• You want improved cooling for the console

Skip if

• You use a PC or other console
• You need shims for smaller chips
• You prefer standard 20x20mm sizes

Verdict: NEW Games Order PS3 Copper Shim Kit is a specialized repair solution for PlayStation 3 owners. It provides the correct size and thermal paste needed to address overheating and Yellow Light of Death problems on Fat and Slim models.

6 Best budget

JIUWU 15x15x0.8mm Copper Heatsink Shims

Best for: Laptops needing thicker copper shims

Material

High Purity Copper

Compatible Device

Laptop GPU and CPU

Dimensions

15mm x 15mm x 0.8mm

Length

0.59 inches

Width

0.59 inches

Weight

0.32 ounces

View on Amazon: JIUWU 15x15x0.8mm Copper Heatsink Shims Affiliate link

This JIUWU pack contains 20 high purity copper pads sized 15mm x 15mm x 0.8mm. The 0.8mm thickness provides more fill space than the 0.3mm shims on this list. You get a larger 15mm footprint compared to the 20mm pads found elsewhere. These specs make them suitable for laptops needing thicker thermal gaps for GPU or CPU cooling.

Pros

• 0.8mm thickness for larger gaps
• 15mm x 15mm square size
• Pack of 20 pads
• High purity copper material

Cons

• 15mm size is smaller than 20mm pads
• 0.8mm thickness may not fit tight gaps
• No adhesive backing mentioned

Good fit if

• You need thicker than 0.3mm fill
• Your heatsink base is 15mm wide
• You are working on a laptop

Skip if

• You require 20mm x 20mm pads
• You need very thin 0.3mm shims
• You want pre-cut 12mm sizes

Verdict: JIUWU 15x15x0.8mm Copper Shim fits laptops with wider thermal gaps. It offers more thickness than the 0.3mm options here. Choose it if your hardware needs a 0.8mm spacer.

7

JIUWU 20x20mm Copper Pad Shim

Best for: filling larger thermal gaps with copper

Material

copper

Compatible Device

IC chipsets, GPUs, and CPUs

Dimensions

20 x 20 x 0.8mm

Length

0.79 inches

Width

0.79 inches

Weight

1.6 ounces

View on Amazon: JIUWU 20x20mm Copper Pad Shim Affiliate link

The JIUWU copper shim measures 20 x 20 x 0.8mm. It uses high-purity copper for efficient heat transfer across IC chipsets, GPUs, and CPUs. This kit includes five size options, allowing you to select the exact thickness needed for your cooling setup. The 1.6-ounce weight ensures stability. You get reliable thermal performance for laptops and desktop components without complex installation.

Pros

• 0.8mm thickness for substantial gap filling
• High-performance copper material for conductivity
• Five size variations available in the assortment
• Compatible with GPUs and CPU chipsets

Cons

• Thicker than the 0.3mm standard shims
• Sold as a kit rather than single pads
• No included adhesive or mounting hardware

Good fit if

• You need to fill larger gaps between heatsinks and surfaces
• You prefer copper over aluminum for conductivity
• You want multiple thickness options in one purchase

Skip if

• You require thin 0.3mm shims for tight spaces
• You need pre-adhesive pads for quick installation
• You are cooling a device with minimal clearance

Verdict: JIUWU 20x20x0.8mm Copper Shim fits users who need thicker spacers for better thermal contact on GPUs or chipsets. It offers versatility through its assorted sizes.

Specifications side by side

Frequently asked questions

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