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Old 04-29-08, 11:52 AM   #1
jcrox
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Default Lapping

I was looking at buying a new cooling solution for my CPU and decided I'd try some lapping before I went dropped a chunk of change and man am I glad I did. I only did the heat sink, not the cpu itself, but there must have been some issue because holy crap what a difference. Previously setting my cpu to 3.2GHz and 1.4v resulted in CoreTemp reporting 30-33c at idle and 60 - 64c when running the 3dMark06 CPU test and that was in the dead of winter when it's nice and cool in here. Now with the same settings CoreTemp reports 24-27c at idle and 45c when running the 3dMark06 CPU test

If you haven't tried this I would highly recommend it. It took me about 25 minutes and the results are fantastic!
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Old 04-29-08, 11:55 AM   #2
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Default Re: Lapping

Quote:
Originally Posted by jcrox
I was looking at buying a new cooling solution for my CPU and decided I'd try some lapping before I went dropped a chunk of change and man am I glad I did. I only did the heat sink, not the cpu itself, but there must have been some issue because holy crap what a difference. Previously setting my cpu to 3.2GHz and 1.4v resulted in CoreTemp reporting 30-33c at idle and 60 - 64c when running the 3dMark06 CPU test and that was in the dead of winter when it's nice and cool in here. Now with the same settings CoreTemp reports 24-27c at idle and 45c when running the 3dMark06 CPU test

If you haven't tried this I would highly recommend it. It took me about 25 minutes and the results are fantastic!
I'd like to try it, but finding an in-depth guide is pretty impossible. So if you have any guidelines, I'd appreciate it!
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Old 04-29-08, 11:57 AM   #3
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Default Re: Lapping

yep i have seen some people lapp the processor. what exactly you use to do get it done? i know Brasso works well for bronze surface.
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Old 04-29-08, 12:00 PM   #4
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Default Re: Lapping

I just followed these instructions, it is really amazingly easy.

http://www.neoseeker.com/Articles/Ha...uides/lapping/

Edit:

temps: Idle and after 5 minutes or so of Orthos small FFTs

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Old 04-29-08, 12:01 PM   #5
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Default Re: Lapping

I heard lapping a heatsink takes a few hours.
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Old 04-29-08, 12:05 PM   #6
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Default Re: Lapping

Quote:
Originally Posted by tjohn
I heard lapping a heatsink takes a few hours.
maybe it depends on the heat sink but I spent less than 30 minutes.

Taped the sand paper to the desk top, dripped a little water on it and did figure 8s, about 5 minutes for each 400, 600, 800 and 1500 grit sandpapers, came out looking like a mirror, I should have taken pictures . If I had spent a few hours on it, I'm afraid my HSF wouldn't make contact with CPU.
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Old 04-29-08, 12:20 PM   #7
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Default Re: Lapping

I think it's better to lap on something like a piece of thick glass because its smoother and will not flex while you are lapping.

The hardest part I would imagine is to hold the HS in the same postion while lapping. Some of those HS are rather big and awkward. You would need to hold it in the same postion, that is flat and not rock it, while lapping otherwise you will get a concave surface that is not flat.



Many years ago I ground my own 10" telescope mirror and it was quite the process. In the end I had a very nice Cassigrainian mirror. I sent it out and had it silvered and it worked very well. But out here where I live in the central valley of California the night sky is getting very polluted and not great for viewing anymore.

http://mysite.verizon.net/res6jv9o/a...ains/id20.html
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Old 04-29-08, 12:34 PM   #8
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Default Re: Lapping

Quote:
Originally Posted by Buckeye
I think it's better to lap on something like a piece of thick glass because its smoother and will not flex while you are lapping.

The hardest part I would imagine is to hold the HS in the same postion while lapping. Some of those HS are rather big and awkward. You would need to hold it in the same postion, that is flat and not rock it, while lapping otherwise you will get a concave surface that is not flat.



Many years ago I ground my own 10" telescope mirror and it was quite the process. In the end I had a very nice Cassigrainian mirror. I sent it out and had it silvered and it worked very well. But out here where I live in the central valley of California the night sky is getting very polluted and not great for viewing anymore.

http://mysite.verizon.net/res6jv9o/a...ains/id20.html
I don't think you're supposed to take all that much off of the heat sink, just enough to smooth it out.
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Old 04-29-08, 12:39 PM   #9
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Default Re: Lapping

Quote:
Originally Posted by jcrox
maybe it depends on the heat sink but I spent less than 30 minutes.

Taped the sand paper to the desk top, dripped a little water on it and did figure 8s, about 5 minutes for each 400, 600, 800 and 1500 grit sandpapers, came out looking like a mirror, I should have taken pictures . If I had spent a few hours on it, I'm afraid my HSF wouldn't make contact with CPU.
You did a gr8 job

My 120 extreme was pretty wobbly but I mounted it anyway and still get gr8 temps so I'm happy with it. I suppose I could do much better with a good lap job
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Old 04-29-08, 12:46 PM   #10
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Default Re: Lapping

http://forums.hardwarelogic.com/f32/...uide-8516.html

http://forum.overclock3d.net/showthread.php?t=4735
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Old 04-29-08, 12:49 PM   #11
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Default Re: Lapping

I think I might have to pop the HSF off again and lap the CPU as well .......
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Old 04-29-08, 01:20 PM   #12
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Default Re: Lapping

Waits for results.
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