1. the IHS (Integrated Heat Spreader) on top of the CPU die can be concave or convex, both resulting in heat transfer not as good as it can be. you want a perfectly flat surface.
2. I think most people start around 400 grit or 800 and work up to 1500 or if possible, 2000 grit.
3. Use a piece of glass or some other extremely flat surface to have the sand paper on and make sure you hold the CPU or heatsink level.
2. I think most people start around 400 grit or 800 and work up to 1500 or if possible, 2000 grit.
3. Use a piece of glass or some other extremely flat surface to have the sand paper on and make sure you hold the CPU or heatsink level.