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[TN] Nathan
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 Posted: Mon Feb 27, 2006 2:47 am Post subject: Advertisement |
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tabasco
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| Posted: Mon Feb 27, 2006 6:33 am Post subject: |
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Just curious, on the subject of the base finish, what have you or others gained in temperature loss, by mirroring the bottom of a CPU heatsink?
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mojo1340
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| Posted: Mon Feb 27, 2006 8:00 am Post subject: |
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| From personal experience, mirror lapping the heatsink will yeild, at most, 1-2C better temps. Of course, it the base of the heatsink isn't dead flat, then it should be lapped (or returned for replacement/refund). TIM can also make a significant difference. |
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[TN] Nathan
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| Posted: Mon Feb 27, 2006 3:31 pm Post subject: |
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An unsmooth surface will yield air pockets and will lower the thermal conductivity of the cpu/cpu cooler interface.
The difference is not huge, but it does help.
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tabasco
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| Posted: Mon Feb 27, 2006 4:59 pm Post subject: |
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| mojo1340 wrote: | | From personal experience, mirror lapping the heatsink will yeild, at most, 1-2C better temps. Of course, it the base of the heatsink isn't dead flat, then it should be lapped (or returned for replacement/refund). TIM can also make a significant difference. |
Thanks for the info mojo. 1-2 degree seems like a good drop for lapping. How do you check for the bottom being totally flat? Lapping on a piece of glass?
What is TIM?
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tabasco
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| Posted: Mon Feb 27, 2006 5:21 pm Post subject: |
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| [TN] Nathan wrote: | An unsmooth surface will yield air pockets and will lower the thermal conductivity of the cpu/cpu cooler interface.
The difference is not huge, but it does help. |
Roger that.
The 1U CPU heatsink we used on our gaming server, had a slight ridge to it that could be felt, ever so slight, but it was there. I thought about mirroring the bottom, and I probably should have. Every degree that you can lower your CPU temp in a 1U case is worth it . It's really hard keeping things cool in a 1U case
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mojo1340
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| Posted: Mon Feb 27, 2006 5:37 pm Post subject: |
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| tabasco wrote: | | mojo1340 wrote: | | From personal experience, mirror lapping the heatsink will yeild, at most, 1-2C better temps. Of course, it the base of the heatsink isn't dead flat, then it should be lapped (or returned for replacement/refund). TIM can also make a significant difference. |
Thanks for the info mojo. 1-2 degree seems like a good drop for lapping. How do you check for the bottom being totally flat? Lapping on a piece of glass?
What is TIM? |
To check for flatness, I use a machinists straight-edge that I happen to own. They can be had for ~$25, but for your purposes, any straight-edge will do. Just lay it on the bottom surface of the 'sink in several places and look to see if any light passes between the two.
I kind of enjoy the lapping process, but many find it tedious and not worth the trouble.
I use an 18" square piece of 0.25" thick piece of glass and various grades of "wet or dry" sandpaper. Unless the sink has some bad scratches, you can start with 600 paper and work your way up tp 2000 grit. Auto body supply houses will have this paper. Use plenty of water and a little (very, very little) dish detergent on all but the final lap. |
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