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Old 6th January, 2007, 07:54 PM
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Is your CPU IHS Really flat?

Hi all,
I've just been reading about some of the problems that the Conroe C2D's IHS has. Basically, a lot of them are quite concave and don't make full contact with the heatsink, especially in the center where the core itself is. Apparently, it is possible to lap the IHS itself without damaging the CPU (it will void your warranty however).

But how do you find out how flat it is? Well now there's a way! At the link below is a grid. Basically, you hold your cpu edge up to your monitor (a flat screen is quite essential for this) and the more distorted the reflection is, the more distorted your IHS is and the worse it's heat transfer properties will be. Grits that are used for lapping are 200, 400, 800, 1600, 2000 and finally Brasso to polish it off. And what about using toothpaste as a fine grit (i got this idea from the tip for repairing scratched discs), you never know, it might work (although i'm not responsible if you mess up your CPU). I know that i'll be checking my new X2 when it arrives.

http://www.thermochill.com/guides/LappingGrid.pdf

You can decrease your temps by between 5C to 20C (or more in the most distorted IHS's)!

HTH,
Scott.
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Old 6th January, 2007, 08:13 PM
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Just use 800 grit paper.
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Old 6th January, 2007, 08:28 PM
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Cadaveca's guid to lapping:
Dave's Guide to Lapping
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Old 6th January, 2007, 08:33 PM
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wow htat's an old one.
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