Lapping Tbird

[brojoh2]

I've had a little bit of lapping experience. I lapped my hs (now doing away with for water) but never the cpu slug. I just want to ask for tips and/or guidance before I dive in so, anyone with expertise - please chime in.

I'm planning on using 600 grit automotive paper on glass backer. I've read the posts, particularly the one by Joe about encasing the whole processor in plastic then cutting out and taping off leaving only the slug exposed. Also, the one about coloring the whole thing in magic marker so as to know for sure where you have been effective.

I know there's like about a bazillion things - tips - tricks of the craft and I can't hope to get them all BUT, I'll be happy with the ones you want to pass along AND I'll put them to good use too. Thanx.

[Spode]

don't even think about lapping a tbird. Even if it survives the ordeal, it won't be any flatter! Those things are darned flat.

[Megahurtz]

Agreed. Remember, you are attempting to get the best possible interface between two surfaces. When they are subject to temperature changes, the likelihood of both the heatsink base, and the die retaining their 'lapped' shape is dubious at best.

They both have to be 'lapped' to eachother in order to get the desired result. Listen to Spode. Socket-A die lapping is somrthing you do not want to undertake, lest you run the risk of taking your CPU to an undertaker..;)

[TT120]

I would never even consider rubbing my $200 chip on a piece of sandpaper.

[jgaud]

i wouldnt even consider using 600 anything i lap i use 1000 wet/dry 3M and and use it wet, that way it takes a while to get to your desired level of removal of material, and when you use it wet, use a few drops of dish soap in the water or on the paper the surfacants in the soap will help carry away material and keep from clogging the grit. 600 IMO is too coarse for a core,but not bad for a sink if you finish with something finer.Dont skimp 3M is the best stuff you can buy

[LoudFan]

Remember, the core is made from almost pure silicon. It's like glass and will chip before sanding. They flatten those things on Diamond lapping stones, they are flat already.

[J.S.]

I lapped my C2 566 i had awhile back and everything was ok,I didn't see a big drop but it did come down 2c.I used 1500 grit w/d.You taking the life of your chip in your own hands when you do this and I won't bother to do it again for what little gain I had,If you do it,take off only as much as needed. good luck

[J.S.]

Also,Use a piece of glass to do it on,you need as flat a surface as possible.

[proze]

not recommended imho. a lot of people, myself included, have done this to coppermines, but socket a chips are much flatter than coppermines, so not many people have seen the need. i don't think it's worth the risk.

if you insist on doing it, though, then 600grit is too coarse. start with 1000 and take your time... work up to 1200, and finish with brass polish or something..

[Hoot]

Ever wonder why AMD puts sealant on their cores? I'm sure it's not free. Think about it.

Hoot

[kat]

i lapped my 1ghz 200 and it made no difference in the temps.. waist of time ;D

[ken257]

Don't lap the Bird they are very good just the way they come. The last time I lapped a cpu was with the old celerons based on .25 micron. The cores were big and often were far from being flat. I have had several that had major gapage when a straight edge was put on top. In this situation lapping gives very good results.