Originally posted by ATI-M
but like normally the finishes on chips are good enough though right?
you don't lap the chip itself, unless you want to kill it. you can lap chipsets (on your mobo, or video cad) but they are totally different than a processor core. the CPU doesn't need lapping, it's the heatsink.
i lapped the stock XP aluminum cooler for my GF, and it lowered temps about 5C (it was really scratched up b4 i did). So it does help, but MY cooler isn't lapped. doesnt need it. make sure you lap it using waterprof sandpaper under a small stream of water. lapping dry can cause scratches and the like.