The ATI-powered T60 and the R60 however, actually needs a copper shim for proper thermal conductivity. This is due to how it uses a poor conducting thermal pad that did not transfer heat very well, leading to high temperatures if I am not mistaken.
Remember, copper shims are not replacements for thermal paste, because they do not fill in the gaps caused by impurities in the 'flat' surface. Copper shims should only be used when thermal paste can't cover up a certain level of thickness, such as acting like a heat-extension bridge which allows for taller gaps to be covered. A proper usage of copper shims, would be to place it in-between a die and a heat-sink whose gap is too tall for thermal paste to cover up. An example:
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|======the heatsink=======| <----the thermal paste----> [-----the copper shim-----] <----the thermal paste----> |=========the die=========|
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