CPU and Heat sink Lapping Guides Well, later than lapping my home workstation work station, I've this irritating little accent in my head decisive me to do the same from the CPU. I did the job with 800 grit sandpaper. Initially, I told myself I'd just buff what's there right now just to see if it's level. After about 30 laps in one course and 30 in the other direction I exposed I had pretty a dipped IHS. So I just kept at it. Two 9x11 pieces of 800 grit later paper later I was left with a darn flat layer of copper looking back at me.
At this point are a few icons and the temp. Outcome is I got from lapping both my CPU and HS. I would recommend that anyone wanting the best decrease in temps should consider lapping both the CPU and HS.
Keep in mind; you're later than there is a flat chip here so doesn’t thrust downward on it as you lap: let the load of your hands do it without extra pressure and go slowly so you don't use uneven pressure. After about 30 laps front-to-back, I gently blotted off the chip with a moist paper towel to remove the metal particles I just sanded off, then rotate it 90 degrees and repeated 30 laps front-to-back. Then you'll want to clean off the sand paper.
I'd advice to change the sand paper normally as it's really responsibility of that work for you. That's essentially it. You can start lap until you can't see variations in the surface of the chip (no silver color is often a good indication that you're flat), move up to 600 or 800, and then finish off with 1000 or 1200. I did mine entirely with 800 and 1000; it just takes longer with finer grits. Remember, the key is FLAT, not shiny. I would recommend that you do NOT polish the chip with a metal polish since you'll leave behind a residue that will hurt your heat transfer.
You can test the smoothness at any point throughout the lapping formula by cautiously placing a razor blade across the surface of his chip and look up at the area where the razor meets the chip. Now situation your eye so that you're level with the chip and pointing at a light source do you see any light coming though? If so, keep at it. Another test you can do is to take a black sharpie marker and make about 9 dots in a 3x3 grid on the surface of the IHS. Lap about 5 times, rotate, and do 5 more. Now look at the dots... did they wear off evenly?
Thermal right Ultra 120 Extreme Lapping
When my Ultra120 X and I have to speak up about I a little confused. The base where it should contact the heat source is not smooth at all, it's in fact ridged! You can see a scrape which is where I gently ran my thumb nail over the surface; I could feel the rough edges.
Anyhow, others expectant me to lap it which I've never done before. After wrestling with the idea for a couple of days as well as reading many articles/guides, I decided to give it a go. $20 worth of sandpaper, a piece of plane goblet, and 4 hours of cautious job later, I was left with a pretty darn flat HS. You can see by the pictures that this particular one was quite concave instead of being flat which isn't good for keeping contact between the HS and IHS of the CPU.
Don’t imagine so as to lapping is for the quiet of mind. If you’re going to do this, plan on spending a weekend (at least) doing it. Don’t bother if you only want to lap either your CPU or heat sink. If you don’t do both, you will see almost NO gain in hotness. Also beware that lapping your CPU is intrinsically risky. So long as you’re cautious to keep yourself stuck, you shouldn’t have problems, but keep in mind that you are both generating huge amounts of friction and placing your CPU near water, both generally not recommended
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