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Lappping a 950 and NH D-14. Help, Advice?! :)

post #1 of 11
Thread Starter 
I need to reset my heatsink and was thinking of lapping it. Worth it?

I don't have that black back cover like I have seen in reviews I have just the clear case (Did I lose that piece or just not used in later revisions?). Is it fine just to use that and masking tape off the sides?

Also any links to great guides/tuts are much appreciated. :3
Edited by Live_free - 1/22/11 at 1:34am
post #2 of 11
i dont see the point in lapping heatsinks as most of the time a good brand heatsink will have an extremely flat finish and lapping it would do more harm than good. however i think lapping the CPU is very worth it.

to do this you need:
2 sheets 600grit wet and dry
3 sheets 800grit wet and dry
3 sheets 1000grit wet and dry
3 sheets 1200grit wet and dry
2 sheets 2000grit wet and dry (if you can find some)

the trick to lapping a cpu is to let the cpu's weight do all the work, you just want to guide it along, dont apply any force downwards on the cpu. using the 600grit make figure 8 patterns in one direction only. do this for 100 passes and then take the cpu off the paper, turn it 90* and do 8's again for 100 times. continue to rotate the cpu, this is important and many people will not do this, but it will help stop any pressure you apply wrecking the surface. you will know when to stop using the 600 grit when there is a small silver circle left in the middle of the cpu about 1/4" in diameter

using the 800 grit do the same process as before but this time stop when there is no silver left. and move on to the 1000grit doing the same process but now looking for a smooth looking surface. ideally with the 1000 grit and higher you will feel the cpu slide on the paper not grip, thats when you change but this takes a lot of experience, for now just stop lapping after a full rotation of the cpu or 360* and look at the surface, there should be no deep scratches.

after that, move on to the 1200grit, here you do the same as every other time, but your going for the shine effect, so you now do not rotate the cpu, just do figure 8's until u have made nice clear 8s on the 3 sheets of paper. if you found some 2000grit paper you can move on to this and do the same as the 1200grit.

thats basically all there is to lapping. id highly recommend getting a less expensive cpu to do first how ever.
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post #3 of 11
Thread Starter 
Bump; Also the site I was reading on it said "L" movements of 100 passes then rotate 90 degrees and to also put a little water down on the sandpaper.


But that last comment concerns me, I may just reset my noctua and see if that improves the temps. Because at 1.25v 4Ghz I am getting 80c. Which just isn't right.
post #4 of 11
I have always dry sanded, and have done so to 15+ chips. I always use the same grits....
600,800,1000,1500,2000,2500. I do 30 reps then rotate 90 degrees for 4 full rotations on each grit. Just make sure to wear an antistatic wrist strap, and as corny as it may sound, I always put a computer case below where I'm lapping, and put my bare foot on a piece of the metal.
    
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post #5 of 11
I just got a 950 and a megahalem, what kind of temp difference would i see between a lapped 950 and a stock 950?
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post #6 of 11
If your ambient is about 22, i7 950, 4Ghz @1.25, D14 should keep temps below 75.

4.2 @1.35 will most likely will put you into the low 80s.

Again ambient temps and voltage play huge roles. How's you QPI voltage?

Lastly, I would lap the heatsink first and see if your happy before lapping the CPU.

Quote:
Originally Posted by Live_free View Post
Bump; Also the site I was reading on it said "L" movements of 100 passes then rotate 90 degrees and to also put a little water down on the sandpaper.


But that last comment concerns me, I may just reset my noctua and see if that improves the temps. Because at 1.25v 4Ghz I am getting 80c. Which just isn't right.
    
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by yati View Post
If your ambient is about 22, i7 950, 4Ghz @1.25, D14 should keep temps below 75.

4.2 @1.35 will most likely will put you into the low 80s.

Again ambient temps and voltage play huge roles. How's you QPI voltage?

Lastly, I would lap the heatsink first and see if your happy before lapping the CPU.
I think I don't have a proper seating on there. It is 50 degrees outside, in my room around 60f. I may just reset it and call it good and keep it at 4Ghz. As I don't want to risk messing it up. lol

Settings: *Note I followed a guide and really only intensively know how to change ram and cpu V and Mhz.

CPU: 1.35v
CPU PLL: 1.88
QPI: 1.35
IOH: 1.24
ICH: 1.20
x21 multi
200 BLCK


EDIT: Just decided to reset my heat sink and went from 85-90 on those settings to 65-70.
There was some thermal paste around the cpu and just.. well not good. That was my first time two months ago. Now much better I went in with a cotton swab an isopropyl alcohol and cleaned it all up.
Edited by Live_free - 1/22/11 at 10:42pm
post #8 of 11
you can get a few pentium 4's off ebay for $20. best way to learn
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post #9 of 11
I wouldn't bother, better off get some good quality TIM.

I have lapped cpu and HSF in the past doesn't make much if any difference and makes it impossible to get the HS off as they stick together so well because of the smooth flat finish.

Interesting though some HS have a slightly curved surface so when you clamp it down maximum pressure is focus on the cente of the CPU for better contact.
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post #10 of 11
Well, I cant be asked to google whether the noctua cooler has a convex(?) base to make up with an unlapped ihs, but i would recommend to atleast lap the cpu, and see how it goes. Lapping the cooler is hard!
All I need for lapping is 600 grit, and 1200.
One of each. Wet paper.
    
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