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iMac 27" 2017 Thermal Paste Replacement

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To reassemble your device, follow these instructions.

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Arty

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what is the thickness of the gaskets?

Andrey Kushnir - crwdns2934203:0crwdne2934203:0

The GPU RAM Thermal Pads are 1.5 thick.

While Apple used a thicker gaping paste (white in color) as it was easier to used on a factory floor. It was not very effective in transferring the heat away. The quality of the thermal pad also plays a role here as well as the GPU's thermal paste. We need to move the heat from the GPU effectively as its heat ramp up can be quite fast, but we don't want to dump the heat sink heat to the RAM so we don't want to effective movement of heat transferring in the wrong direction. This is more so when heavy graphics are being run. It is advised to install a good thermal monitoring App watching once's thermals and ramping up the fans RPM to more aggressively cool the system during heavy work loads.

Dan -

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