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lapping/polishing whats best

post #1 of 13
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ok maybe you guys can clear this up for me a bit, i understand exactly what each is and all that stuff but what im interested in is somestuff that i read a couple dyas ago about lapping then polishing to such a fine smoothness that it actually stops helping and starts degrading the temp that youll get

i think one of the threads i saw that had a link to some experiments was on extreme systems but i cant find it again, this link detailed some stuff about how with a slightly rougher surface like 1200 grit instead 2000/2500 would give you better temps due something about the tiny little peaks would crush down a bit and with the thermal paste creat more of a surface area and promote better heat transfer

now i could be off on the grits i am thinking but you should get the idea, anyways any info from any searches you guys have done in the past would be much appreciated, thanks
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post #2 of 13
Wow, so many lapping questions lately.

I think that 90% of the members are obssesive/compusive - I am.

If you do a nice lapping job on your surface(s) to anything from 1200 to 2500 grit you will see a dramatic drop in temps that will open up higher clock speed potentials, if you so choose. Or, it will drop your current high-temps to numbers that are far more comfortable.

I wouldn't agonise too much over it. I'm not trying to be an arse.... I went to 2500... But I don't think that it was necessary.
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post #3 of 13
rofl and i think you're right syr ! and i still have to test 12000 grit. i think it's an overkill but you never know.

i think the best performance out of lapping is: the biggest surface (meaning the biggest cm per surface..) damn my technical english is bad
post #4 of 13
Blowie, you are now knighted "OCN's lapping guinea pig"

I hope that you do it and that you post the best pics that you can take.
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post #5 of 13
If it's not concave I just hit it on 1000 grit on plate glass till I 'm sure it's flat and smooth....If it's concave I use 800 grit and valve grinding compound till flat the hit it on 1000 grit...I don't see the need to make it mirror like...
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post #6 of 13
Quote:
Originally Posted by ira-k View Post
If it's not concave I just hit it on 1000 grit on plate glass till I 'm sure it's flat and smooth....If it's concave I use 800 grit and valve grinding compound till flat the hit it on 1000 grit...I don't see the need to make it mirror like...
You should lap as fine as possible such that the largest grain size of thermal interface material in the matrix will overfill the scratches. That is, put another way... lap until the micronized silver particles in AS5 are too big for the grooves left by your snadpaper. :-)

Which is no time soon. You can't lap too much, using a sound technique - generate flatness first and foremost and then the minimum RMS surface finish.

David


EDIT: Of course there is a law of diminishing returns the finer you go... but until you match the scratch grooves to the TIM particle size, you will not have reached the theoretical maximum benefit from lapping. My suggestion - lap through 2000 grit minimum and go beyond that as your budget, patience, and strength permit. :-)
post #7 of 13
Really? I think it's a waste of time....No harm I guess if you want to...But not really needed....
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post #8 of 13
Quote:
Originally Posted by ira-k View Post
Really? I think it's a waste of time....No harm I guess if you want to...But not really needed....

I agree that it's a matter of preference. But if you're considering lapping to begin with, why not do it right and go all the way?

I guarantee you that the driver at the dragstrip wants every single horsepower out of his engine. Period. And if you have a need for lapping, going that extra step or two might be what it takes to get that extra 1C out of your cooler.

Once again, it takes time and effort to lap your sink and CPU. It's not for everyone. :-)

David

post #9 of 13
LOL...Yeah thats why I just started cutting off my IHS's....
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post #10 of 13
Quote:
Originally Posted by ira-k View Post
LOL...Yeah thats why I just started cutting off my IHS's....
Exactly!
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