Tech ARP posted a CPU & Heatsink Lapping Guide
A quote from the article:
The CPU & Heatsink Lapping Guide
Reducing the CPU temperature has always involved newer, larger heatsinks with ever more powerful fans. All of that mean extra costs. But what if you could have better cooling without the extra cost?
For only $20 in sandpaper, you could reduce your CPU core temperature by 15%! So, join graysky as he shows you how to lap your CPU heatspreader and heatsink for a much better thermal contact and better cooling performance.
The CPU & Heatsink Lapping Guide