Thread: Lapping FTW
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Old 03-17-09, 12:49 PM   #37
Join Date: Mar 2004
Posts: 15,486
Default Re: Lapping FTW

Originally Posted by mailman2 View Post
I used to start with 400. Now I start with 180 and get it to copper in minutes. Then I jump to 400 and finish with 600. The mirror finish makes it hard for the TIM to actually work. It has been recomended among veterns of OC and lapping that 600 or 800 is better cause there are actually slight imperfections for the TIM to settle in.
ideally, the TIM is supposed to be used in a very thin layer to create a contact between the imperfections in the heat spreader and the heat sink.

so, either higher grit with less grease, or lower grit with a little more grease.

but, the grease has a thermal resistance, so higher grit should create a better contact which should create better conduction. so, higher grit with a very small amount of grease should be the best.

Its not how mirror smooth the finish is, its the fact that you are levelling the surface making it true so that you get better contact across the IHS.
technically both should factor into how well it conducts heat.
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