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Lapping new CPU waterblocks? - Page 2

post #11 of 20
I lapped both the water block and CPU, and if I remember correctly it shaves about 2C.

http://www.overclock.net/t/1442038/build-log-the-hawaiian-heat-wave/50
Edited by Gunderman456 - 11/16/16 at 3:57pm
 
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post #12 of 20
Machining marks rarely make a difference when it comes to temps. If you feel the need to lap it make sure you remove the base from the block before lapping otherwise you'll lap out the 'bow' needed to make good contact with the IHS.

Sometimes re-seating the block can improve the temperatures (or make them worse) by a couple of degrees even using the same TIM.
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post #13 of 20
Thread Starter 
Quote:
Originally Posted by Big Elf View Post

...make sure you remove the base from the block before lapping otherwise you'll lap out the 'bow' needed to make good contact with the IHS.

Sometimes re-seating the block can improve the temperatures (or make them worse) by a couple of degrees even using the same TIM.

Thanks for the reminder for doing this, the block would of been taken apart, but it's good to have a reminder to not mess up my block!

I figure a little polishing won't hurt since I'm tearing the block apart anyway.

Cheers
post #14 of 20
Hey, if you have a proper glass surafe that looks flat, you can place a sand paper on top and lapp your copponents, theres no risk of making the block less flat than it was before.
I start from 80-120 grit sand paper. I had lapped 5 CPU blocks, and 2 CPUS, always gave me better cooling over non lapped suraface.

I had a cpu block that was quite rough, was my first cpu block and only block, got less performance than AIO chill and woundered why, lapped my block and it solved the plorbem.
post #15 of 20
Thread Starter 
Quote:
Originally Posted by Iwamotto Tetsuz View Post

Hey, if you have a proper glass surafe that looks flat, you can place a sand paper on top and lapp your copponents, theres no risk of making the block less flat than it was before.
I start from 80-120 grit sand paper. I had lapped 5 CPU blocks, and 2 CPUS, always gave me better cooling over non lapped suraface.

I had a cpu block that was quite rough, was my first cpu block and only block, got less performance than AIO chill and woundered why, lapped my block and it solved the plorbem.

I'd likely start at 800 grit, since the tooling marks aren't that deep, and go from there. I have 800-3000 grit, I have a few panes of glass that are definitely flat, so I'll likely use that. But like big elf mentioned above, just gotta make sure to take the plate off the base to not remove the curve, especially since I'm not planning on doing my CPU.
post #16 of 20
Well, I lapped two cpus, and they took at least 10 minutes for me to lapp untill the whole surface is flat, I also used 100Grit sand paper. I never had any block or cpu that comes out of the factory perfect.


Unless your buying EK blocks or other expensive brands, which I think are pefrectly flat, flatter than any home lapped block.

I don't think 800 grit will do much to your cooling performance, the main idea is getting a flat suraface, if the surace is concaved or convex, getting a mirror like surface wouldn't do much.
post #17 of 20
If it's generally flat, leave it alone.

Surface roughness/machining marks, unless they are extreme, won't hurt.
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post #18 of 20
I lapped both my CPU block and the processors IHS on every build over the past 10 years and have had substantial improvements in temps. Intel's heat spreaders are notorious for being concave. (or was it convex?)
post #19 of 20
Quote:
Originally Posted by Iwamotto Tetsuz View Post

Hey, if you have a proper glass surafe that looks flat, you can place a sand paper on top and lapp your copponents, theres no risk of making the block less flat than it was before.
I start from 80-120 grit sand paper. I had lapped 5 CPU blocks, and 2 CPUS, always gave me better cooling over non lapped suraface.

I had a cpu block that was quite rough, was my first cpu block and only block, got less performance than AIO chill and woundered why, lapped my block and it solved the plorbem.

umm 80-120 grit? *** did they use? a hack saw? 80-120 grit is what you use to sand drywall... 80 grit if your work looks like ****, 120 if it's mostly smooth. I couldn't imagine using 80 grit to make a CPU block smoother than it already is. I'm hoping you meant to say 800-1200 grit...
post #20 of 20
I do mean 80-120Girt, then I go to 240 or 320grit, then 500, 1000 girt.
If I had the whole set of sand papers I would do 80-240-320-500-800-1000-1500-2000
Quote:
Originally Posted by Andrew LB View Post

I lapped both my CPU block and the processors IHS on every build over the past 10 years and have had substantial improvements in temps. Intel's heat spreaders are notorious for being concave. (or was it convex?)
Most intels use paste to transfer heat to IHS, the bottle neck is the paste to IHS heat trasnfer, not from IHS to cpu block.
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