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What effect does lapping have...!?

post #1 of 8
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Hi guys,
With the new heatsink in the house, you can imagine I want to OC the hell out of my CPU. So I was thinking about lapping. Although it seems easy and fairly cheap, I don't want to risk anything or waste my time if lapping would only drop temperature by 1 or 2 degrees. On the other hand if there is a big drop, then I'm up to the challenge So can you guys tell me the average temperature drop that you can get from lapping?

Thanks,
Yours truly,
Alex
    
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post #2 of 8
Usually you get about a 5-7 C drop in temps. If you have a few hours to spare, I would highly recommend doing it.
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I <3 480's
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post #3 of 8
I dropped nearly 15°C on load after lapping both my heatsink and CPU. A worthwhile investment.
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post #4 of 8
increased contact on the cpu and heatsink for better heat transfer to the heatsink (cooler cpu).

No risk really to the heatsink (maybe crooked, but nothing that cannot be fixed)

To the cpu, there's the voiding of the warranty, and some risk for it not working afterwards for a number of reasons...
quad core madness
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quad core madness
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post #5 of 8
I dropped 7C with just a Heatsink lap
post #6 of 8
Nothing is ever so smooth so by lapping your CPU or Heatsink, it makes these little rough spots or pores lessen, therefore heat will be lessened trapped allowing more face to face from CPU and Heatsink to work better, so there are no trapped heat within these rough pores. And then giving you around 10C drop in temperature. Every degree in celcius counts. ;D
    
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post #7 of 8
Lapping can make a vast difference if either your CPU or your heat sink are warped. A easy way to test this is to take a razor blade and hold it against the surfaces with a light behind it. If the surface is warped, you will see light come through the gap between the blade and the CPU/HSF.

If your surfaces appear to be nearly perfect, then it's a question of if you have the time and the materials. I've lapped two set's so far and enjoyed the process. It's fun.
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post #8 of 8
If it feels rough try a sheet of 320 (fine) emery cloth first, then work up.
That will cut the surface flat quickly.
When I did the BT which was not only very rough but none to flat either it was quick to get it to 800g, about 15 minutes of work.
    
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