Originally Posted by Ch13f121
Ok, when I lap this thing, so I can use a 939 processor with it, I need to lap it down to the copper, and then some. Reason being is that my 478 chip made grooves where the corners was, and I can see copper. This will most likely affect my temperature...so I'd feel better getting this off, and lapping the nickel off. Any ideas on what to use? I know micron grit sandpaper will work, but is there anything else I could try to get all the copper to show?
Poor Thermaltake XP120
. Lappings fairly simple. If you need to get those nasty corners nice and flat start with a P220 grit. My KINGWIN KWVC-3 for my video card pretty much had the same problem. Just make sure that the surface your lapping it on is flat and you tape down your sandpaper tightly so it doesn't move around nor cause an air gap. Start from 220, just enough to where the surface is actually leveled (it doesn't take that much pressure doing it on aluminum, so be careful). Once you feel the heatsink move easier around the sand paper, apply less pressure. This process took me atleast 20 minutes to get the paint/polish off. If you couldn't get it all off, do not fear. Just move up to a 400 grit once you feel the surface is straight. That will take off the the majority of it off. Follow the same steps all the way through 220,400, and 600. I made sure that all the paint/ polish was off witht he 600 grit before stepping to the 800. Once you move to a 800 grit, use less presure. I did it all the way from 220,400,600,800,1000, and 1500. I hope that will help you out.