lapping the CPU?

[Phugbox]

ok, now, I understand the concept of lapping heatsinks if they are uneven, to ensure better thermal transfer. I also understand that cpu's are pretty dang fragile, and not to mess ith them unnless you've you've got the cash and don't mind having another shiny keychain cuz you got a little too rambunnctious with your silicon core.

But then I see people mentioning lapping their core, no at first you could pass this off as them simply meaning lapping the heatsink, but saying core, but no, because they ALSO mention lapping the heatsink. they say these to thigns separately but close enough together to make them not be the same item being lapped.

hat's going on here, please explain this to me?

[Starfoxer]

sand your core until it is smooth and flat :D pretty much the
same principal as with a heatsink.

[Garrett_thief2]

What grit paper are you guys using to lap the Athlon XP cores?

not sure i wanna do this, but i just had my water block off tonight, and the AS3 patern on the block was a bit iregular.....the core must be a bit jagged.My WB is lapped to 800 grit on glass and is very smooth....

[Inept]

Just crazy people. Might make some sense to lap the heat spreader on a P4, though once you get through to the copper beware of oxidation. Lapping a CPU die is kinda silly, I doubt a person could do better than a machine specially designed for lapping, then again there are some highly motivated people.

Some people like to try lapping the laser etching off their AMD cores. Again, I don't see why and I doubt they experience any benefits.

[Garrett_thief2]

The core on my xp 1900 seems to have a small bump on one corner.....it leaves a distinct impression in the as3 on my wb....

I really don't want to lap it....but it might actually save my core from chipping

[looktall]

Originally posted by Garrett_thief2
I really don't want to lap it....but it might actually save my core from chipping

and it might totally f*** the core altogether.
as i'm sure you knw, AMD cores are VERY fragile.

i wouldn't even consider lapping one of those.
a P4 or a tuatalin with a IHS, i would do without a worry.
but i wouldn't be too keen to lap the actual core.

i've lapped an old medochino celeron before and that's pretty harmless. unless you get all crazy about it and go too hard.

only lap your cpu, if you're prepared to fork out for a new one.
out of your own pocket too, because, obviously, lapping it will destroy your warranty. :p

[cack01]

I think lapping the core is one of those things in life you can do without. First off as mentioned before these things are percision made, and usually are very flat or at least flat enough. I have talked to a few people that have talked about lapping their core, and seeing no temp difference. If you can lay a knife flat across the core, don't even think about lapping it.

Although yes lapping the core can help, I don't think the outcome is big enough to support doing it. Even though I have never lapped a core, I would sugest using a very fine grit say around 1500-2000; I say this b/c although the grit is too fine to really do anything major, there isn't much core there, and you don't have a margine of error like you do in a Heat Sink.

Good luck if any of you try it.

[Phugbox]

I'm very glad to see that I'm not the only one who thinks it's a little bit crazy. I'll stick to unlocking my coreand lapping my heatsink

[dream caster]

read Lapping the core (http://forum.oc-forums.com/vb/showthread.php?s=&threadid=108944), in this forum.
I don't plan doing it , but certainly it is in my mind as one thing to do some day.

[steveyboy]

hell im going to lap my core sometime over the next couple of days, i was never able to get every bit of the previously applied thermal pad off

[rogerdugans]

I did it on one TBird I have- and the chip survived.

[disclaimer: I am a highly trained idiot- do not try this at home ;) ]

BUT, I don't recommend it: those cores are EXTREMELY fragile.

If you try it you better be willing to kill the chip!!!!
I did get better results with mine, due to some caked on crud that I just could not remove- alcohol, goo-gone (or whatever that stuff is called..) nothing would do the trick, so I used some 2000 grit paper and very carefully lapped the core just enough to get rid of the gunk, mainly. There is visible evidence that the core was lapped, but not much.

Be VERY, VERY careful if you do this.

[NoKtEm]

hmmm what about lapping GPU's?

[Slougi]

Originally posted by NoKtEm
hmmm what about lapping GPU's?
I've done it, and it's feasible. GPU's are usually concave, very much so in fact. I got 40 Mhz extra out of my gf2 after lapping it.

[1Time]

I lapped my XP core with 600 grit wet/dry... well almost. I was surprised to see how concave that small little square was. I only worked on it for about 10 minutes and didn't even get it all flat before I chickened out. Now with the price of 1600+ XP's so low, I'll probably give it more of a try next time.

[Garrett_thief2]

I can *afford* to burn a chip.......but i don't really want to....

But i don't WANT to lap it.......but i have a good reason to.....there is a bump in one corner....you can easily see the pattern in the AS3 imprint on my WB......so if i lap it, and it blows......oh well.....i'll buy another......

If you can't afford to burn hardware....you shouldn't overclock....heck......i run a stroker big block Mopar......i know what risk is about....... :D

[adamtekh]

i take conors prety fast in my suped up suzuki sidekick , but i wouldnt even try to lap my t-bird

[parkan]

Just fyi, the core is laser-cut, so that's about as smooth as you can get ;)