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((Short description|Computer component))
((Other uses|Shim (disambiguation)))
((Multiple issues|
((More citations needed|date=February 2024))
((original research|date=February 2024))))

[[File:Shim.png|thumb|A CPU shim]]

A '''CPU shim''' (also called CPU spacer) is a [[Shim (engineering)|shim]] used between the [[Central processing unit|CPU]] and the [[heat sink]] in a computer. Shims make it easier and less risky to mount a heatsink on the processor because it stabilizes the heatsink, preventing accidental damaging of the fragile CPU packaging.<ref>((Cite web |date=2003-05-26 |title=What is a Shim and Why Should You Use One |url=https://www.legitreviews.com/what-is-a-shim-and-why-should-you-use-one_64 |access-date=2024-02-29 |website=Legit Reviews))</ref> They help distribute weight evenly over the surface.

CPU shims are usually made of thin and very flat [[aluminium]] or [[copper]]. Copper has good [[heat]] dissipation capacity but is [[Electrical conductivity|electrically conductive]]. CPU shims should be non-conductive to prevent any accidental [[short circuit]]ing. Aluminium shims are often [[Anodizing|anodized]], which makes them non-conductive and improves their appearance (see [[case modding]]). It is also very important that the shim is the proper thickness. If it is too thick then the heatsink will not make contact with the CPU, resulting in poor cooling and possibly overheating.

Most shims are [[CNC]] manufactured, often using [[laser cutting]]. Cheaper ones may be pressed or stamped which could make them less accurate.

== Usage ==
CPU shims are not common at all in [[Original equipment manufacturer|OEM]] computers, but are used by some computer hardware enthusiasts who may use heavier heatsinks because they wish to have a cooler or less noisy system or perhaps to [[Overclocking|overclock]] the CPU for better performance. A heavy heatsink puts more pressure on the CPU and motherboard. Shims are very useful for people who often change CPU, heatsink or [[Computer cooling|cooling solutions]], or use a heatsink that is heavier than the CPU manufacturer's recommended weight.

CPU shims are nowadays largely obsolete because most modern processors designed for home users since the introduction of the [[Athlon 64]] and [[Pentium 4]] have an [[Integrated Heat Spreader]] (IHS) which prevents the CPU core from being accidentally broken.

== See also ==
* [[Computer fan]]
* [[Computer cooling]]
* [[Thermal grease]]

== References ==
((Reflist))

((Hardware-stub))

[[Category:Computer hardware cooling]]

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