Originally Posted by OcSlave
i lapped my old phenom 940, took about 3h of boring sanding down, i thought i got a good finish as i could see myself in the reflection.
Tobe honest temps was still the same, maybe 1c lower.
So from my experience id say do'nt bother lapping, it does'nt really do anything, and the bit it does do is'nt worth the aggrevation of doing it.
There is allso a risk that you may damage the cpu while lapping aswell as voiding warrenty.
Just thought i'd share my experience, i would allso never lap a cpu again, just not worth it.
Then you did something wrong. Every CPU, or anything else for that matter that I've lapped (NB cooler, heat sinks, etc.) have had at least
a 10C drop. Hell, my old lapped x3 720 and lapped Big Typhoon would never see over 49C --and that was after 18 hours of Prime95. (@ 1.5v)
The NB I lapped dropped temps 10C as well.
However, to get the most effect from lapping, the cooler has to be lapped as well, especially if the surface is REALLY rough.
Originally Posted by purpleannex
You want to buy something like this.
Start off with a low grit, then gradually increase up to as hi as you can find, i can't remember exactly but think you can get 3000-5000 grit? Doesn't matter anyway, find the highest you can. Don't do the whole job with 120 grit!
There's is no benefit going beyond 800, it'll just look pretty.
And another note about lapping, especially
when mating 2 lapped surfaces together. You need
to go with a with a thinner TIM. Something like that white pigeon poop that comes with most CPU's.
Also, you have to use TIM very sparingly mating two perfect surfaces together.