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Worth lapping my CPU? - Page 2

post #11 of 20
I also needed to add this because I don't think I ever hear it mentioned, and it is important.

The exposed copper surface will oxidize so use it soon, or you'll have to redo it if you don't put it together for a while (only the fine grit) to remove the oxidation.
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post #12 of 20
More even contact with alleged surfaces. Thus, higher surface area for heat conduction, lower temps.
 
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post #13 of 20
Quote:
Originally Posted by TheSandman View Post

just curious but thermal paste exists to fill in the imperfections to get even disribution if you lap it so both are 100% perfect there wouldnt really be a need for thermal paste would there lol

Correct but you will need specialist tools to get both the heat sink and CPU 100% perfect. But when you get both perfectly flat and put them together you will need specialist tools to get them apart without damaging the CPU.
    
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post #14 of 20
Agree with what others have said.

Only lap it if it will solve a problem for you. If your volts are still within tolerance of more but your running into temp problems which others dont seem to have you can check your cooler is mounted correctly. If its still not right it might be worth considering lapping. Not all the heat spreaders are made equil and some might be a bit lop sided. This happened with my i7 and i lapped it and brought the temps in line and its now happy at 4ghz. In my case one of my cores was a lot higher than the others. I lapped both cpu and Heat sink.

I didnt do it for a few months though.

If my temps were find and the CPU was behaving normally i wouldnt worry about lapping. Just solve the problems as they come along.
Edited by timd78 - 11/18/11 at 4:11pm
post #15 of 20
Thread Starter 
Fair calls all round.
Rep given out smile.gif
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post #16 of 20
Quote:
Originally Posted by andrews2547 View Post

Correct but you will need specialist tools to get both the heat sink and CPU 100% perfect. But when you get both perfectly flat and put them together you will need specialist tools to get them apart without damaging the CPU.

lol yea but i figured id point that out biggrin.gif
post #17 of 20
i gotta say no do not lap your sandy bridge cpu.. i took the ihs off mine the other day..get a bowed heatsink/waterblock instead..been there..done it..worse temps..wish i hadn't lapped the bow off my cold plate..it has to do with the orientation of the silicon under the ihs..with my particular chip..the solder had a gap in between the ihs and chip frown.gif instead of rmaing..i chose to remove ihs biggrin.gif

get some really thick TIM ..i.e. good grade shin etsu biggrin.gif
Edited by Schmuckley - 11/19/11 at 7:21am
 
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post #18 of 20
Quote:
Originally Posted by TheSandman View Post

lol yea but i figured id point that out biggrin.gif

Fair enough tongue.gif
    
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post #19 of 20
This is an interesting topic and I've always wondered why? Why is the surface of the CPU not manufactured flat by default?
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post #20 of 20
Because the goal is a near flat mount with more pressure in middle, where higher heat transfer occurs, and a flat waterblock and flat IHS doesnt equal ideal mount or best heat transfer.

If both cpu and waterblock are slightly convex, or at least one of the two is, then when a good mount with 250N of force is applied, the waterblock and/or cpu IHS flatten but still have higher pressure/better contact in central 1/3 vs periphery, and testing has shown better temps in that scenario.

With a completely flat IHS and flat waterblock, once you attach a waterblock especially with most force on periphery, again the waterblock bows which causes more pressure/better contact now in periphery, vs middle. Temps are then worse under those conditions.

People with equipment to accurately test have shown better temps with slightly bowed waterblock, and no change if lapping IHS flat vs leaving slightly IHS slightly convex.

The only way you should get better temps by lapping would be a rare case of a deformed/concave IHS.

Given the conductance of TIM and comparing indigo xtreme to others, anyway who sees any more than a couple degrees change with lapping, either had a bad mount to start out with, or again a deformed IHS.
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