Replace the paste on the GPU on the iMac Intel 17"
Which one of the two heat sinks has the GPU underneath it?
Should I reapply the thermal compound on both heat sinks while I'm at it?
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I would use the CPU fan replacement guide to point to which one is for the CPU. That guide is here. Personally if you are having heat issues I would reapply thermal compound/paste to both the GPU & CPU. You do not apply thermal compound/paste to the heat sink, it is applied to the processor - thin as possible, yet still covering. A rough guide for applying thermal compound is here. I recommend using the Arctic silver thermal compound/paste available here.
Guide
How to Apply Thermal Paste
Difficulty:
Moderate
—
5 - 20 minutes
Guide
iMac Intel 17" CPU Fan Replacement
Difficulty:
Difficult
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