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jcrox
04-29-08, 12:52 PM
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 :thumbsup:

If you haven't tried this I would highly recommend it. It took me about 25 minutes and the results are fantastic!

Toss3
04-29-08, 12:55 PM
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 :thumbsup:

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! :D

hirantha
04-29-08, 12:57 PM
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.

jcrox
04-29-08, 01:00 PM
I just followed these instructions, it is really amazingly easy.

http://www.neoseeker.com/Articles/Hardware/Guides/lapping/

Edit:

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

http://img171.imageshack.us/img171/3321/newtempsay2.jpg

tjohn
04-29-08, 01:01 PM
I heard lapping a heatsink takes a few hours.

jcrox
04-29-08, 01:05 PM
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.

Buckeye
04-29-08, 01:20 PM
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/astronomy-trains/id20.html

jcrox
04-29-08, 01:34 PM
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/astronomy-trains/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.

tjohn
04-29-08, 01:39 PM
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 :thumbsup:

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 :D

mullet
04-29-08, 01:46 PM
http://forums.hardwarelogic.com/f32/lapping-your-cpu-guide-8516.html

http://forum.overclock3d.net/showthread.php?t=4735

jcrox
04-29-08, 01:49 PM
I think I might have to pop the HSF off again and lap the CPU as well .......

mullet
04-29-08, 02:20 PM
Waits for results. (popcorn)

Revs
04-29-08, 02:31 PM
I just did my CPU as the finish on the water block was pretty good. Really easy to do the CPU though. All I used was a single sheet of 1200grit wet and dry, a granite chopping board and a splash of water, and started buffing. Came out like this>

http://img156.imageshack.us/img156/7401/27012008109se0.jpg

stevemedes
04-29-08, 06:35 PM
24C idle with a Blue Orb on a C2D at 1.4v? Color me impressed, or skeptical about the accuracy of those temps.

My e6400 at 3.2 with 1.365v with tuniq tower on medium and six 120mm case fans idles 35C?

mailman2
04-29-08, 07:02 PM
Great guide.

http://www.thetechrepository.com/showthread.php?t=71

grey_1
04-29-08, 07:03 PM
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/astronomy-trains/id20.html
A decent trick is to draw a cross with a black sharpie, corner to corner. It will show up the really uneven portions of the base after a couple of passes.

+1 on the glass also.

CaptNKILL
04-29-08, 08:53 PM
A decent trick is to draw a cross with a black sharpie, corner to corner. It will show up the really uneven portions of the base after a couple of passes.

+1 on the glass also.
Good idea. I'll have to try that if I ever lap another heatsink. I lapped my Ultra 120 Extreme and it seemed to work pretty well. The thing cools so well though, I don't see myself replacing this heatsink until it no longer fits the latest CPUs.

jcrox
04-29-08, 11:26 PM
24C idle with a Blue Orb on a C2D at 1.4v? Color me impressed, or skeptical about the accuracy of those temps.

My e6400 at 3.2 with 1.365v with tuniq tower on medium and six 120mm case fans idles 35C?

Yeah, CoreTemp reads a bit different than something like nvMonitor that reports the cpu temp rather than the temp of each core, nvMonitor reads 29-30c. This really is a pretty decent HSF though, especially for the price... big, heavy, cools well and glows blue...everything I could ask for.

esaym
04-30-08, 03:27 AM
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.

\

That is what I can't ever get away from. All the ones I have done started to get round. Guess I will just stick to maybe using scotchbrite by hand or something...

dxx
04-30-08, 04:09 AM
You know, I'd hate to call you guys a bunch of nerds, but you do appear to have made it 20 posts into a thread entitled 'lapping' in which you discuss temperatures and polishing heatsinks and CPUs, all without a single reference to the first thing that came to my mind when I saw that thread title...

jcrox
04-30-08, 05:39 PM
You know, I'd hate to call you guys a bunch of nerds, but you do appear to have made it 20 posts into a thread entitled 'lapping' in which you discuss temperatures and polishing heatsinks and CPUs, all without a single reference to the first thing that came to my mind when I saw that thread title...

You know, I'd hate to call you a pervert but......

FastRedPonyCar
05-01-08, 10:57 AM
Haven't thought about lapping the cpu but my zalman came like this out of the box.

http://img.photobucket.com/albums/v212/fastredponycar/Computer/C2D%20Machine/IMG_7474.jpg

brady
05-05-08, 08:30 AM
I've been looking into lapping for the past few days. I think I'm gunna lap my Ultra 120 Extreme and the Q6600. The hottest core idles at 45C at 3.6 and 1.4v. I think with both the HS and CPU lapped I could knock at least 5C of that temp.

My biggest problem is the placement of my system. I use it mostly for gaming and have it hooked up to the living room HDTV. My case is just some crappy case I've hung on to through the years. The side panel is off and I've got fans taped and tied to the case. It looks really great :thumbdwn: . Anyway, the thing is sitting behind the TV and there's about 6" from the open side to the wall. Not much room for air to vent out and the TV generates a fair amount of heat after it's been on for a while. I've got fans taking air in the front of the case and exhausting out the back but there's just not enough fresh air that gets back there.

http://img183.imageshack.us/img183/7203/computeril7.jpg

I bought a 50" VGA cable because I thought I could run the cable under the carpet and put the machine in a more open area but then the problem is that my optical audio cable wont reach the reciever sitting under the TV and I can't find an optical cable longer than 12'. Also, even though the area I wanted to stick it was more open and didn't have an extra heat source like a TV it's still not prime spot since there's little air flow back there (bottom right corner to the right of the couch and under the arm chair).

The best place to stick it would probably be to the right of the left bookshelf. My cables would reach but the thing holding me back from doing that is the uglyness of my case. I've got this hold over from the days we were super poor and that is that the last thing I would spend money on as far as my computers would go was the case. I still do that. So I guess I either need to buy a new case or build a decent looking case.

/end story (wow I wrote a lot)

XDanger
05-05-08, 10:02 AM
Haven't thought about lapping the cpu but my zalman came like this out of the box.

http://img.photobucket.com/albums/v212/fastredponycar/Computer/C2D%20Machine/IMG_7474.jpg
Yeah ,They come with a mirrored sticker on them ,Make sure you peel it off before you install it .

Smee
05-07-08, 02:33 AM
Yeah ,They come with a mirrored sticker on them ,Make sure you peel it off before you install it .


lol