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**POLL**SLK800 users, please look

People used to lap last time when the heatsink makers still did not give a sh1t about the surface of the heatsink. But now, especially for the SLK800, I don't think it warrants any lapping and I don't think it'll help a lot if you lap it.
 
Mine was originally very smooth on the bottom, but has developed some small pits where it makes contact with the cpu die. I don't know how or why that happened. So I'm going to lap it next time I change cpu's.
 
I lapped mine before I even put it on. Didnt quite get a mirror finish or anything but it is now extremely smooth. When I bought it it was pretty good, but I could still feel the circular grooves in it. I just got my system set up the other day, but so far the results look pretty good. With a 39CFM fan at 5V the my 1700+ at 2GHz(1.65v) is hovering right around 35c idle, 40 max.

Brian
 
I had my dog lap mine, but it didn't seem to help temps.








Nah, mine came already polished and smooth and ready to rock. 🙂
 
no lapping here. I have the vantec stealth fan atop mine and my current 2400+ idles at a cool 41C and is 47C under load. My previous 1800+ ran at 43C (49 under load).
 
Originally posted by: msi1337
If I have an SK6+, is it worth me upgrading to a SLK-800 ?

I do moderate o/cing
Click to expand...

It'll almost definitely help you the temps department, but the main improvement you should immediately notice is the reduction in noise...provided that you don't use one of those Vantec Tornadoes 🙂
 
I always lap my heatsinks.
Even high-quality manufacturers leave room for improvement in the heatsink base.
I've used an aplha 8045 & an slk900 and they were both smooth, but ridges could be felt with a fingernail.
The simple physics of lapping compels me to do it. It has to have a beneficial effect if done properly.
More metal on metal contact area = less thermal paste acting as a conductor = better heat transfer
 
Yeah, have a tornado on mine. yep, L-O-U-D that spells sucks. Have one of those Koolance setups coming and when I finally decide on what water block I want, that babies coming off! Right now with an XP 3000+ running at 2.3 Ghz I am getting temps around 37-38 c idle.
 
Originally posted by: jinduy
err what is lapping...sounds like some sort of smoothing...
Click to expand...

Flattening and smoothing the bottom surface of the heatsink. You put wet/dry sandpaper on a very flat surface and run the heatsink along it in one direction only. Depending on how bad the heatsink is, you may start with 400 grit, then you work your way up. Some people stop at 600, others at 2000.
 
On the subject of lapping, in industry there are machines that do lapping. We had a small one in our materials lab to polish the surface before etching to see the grain patterns. Those use a lapping paste to polish the surfaces. Just a little FYI.

P-X
 
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