Are there two different kinds of thermal paste on the iMac model a1224 2.66 AMD video card? Will Arctic Silver work for all five contact points? When I disassembled the iMac the video card seemed to have two different kinds of thermal paste.
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No, you can’t use the same TIM across all of the chips!
The GPU its self needs a thin TIM like Arctic Silver5, The VRAM chips, the four chips around the GPU need either a thick gaping paste or better yet thermal pads!
Dry fit the heatsink and then use either a feeler gage or a bunch of strips of card stock to place between the VRAM chips and the heat sink, then measure the thickness. You want something just a little thicker.
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