I've been away from Tom's forums for a couple months, but when I left last I was considering lapping (sanding) my new i7 core 860 lynnfield. At the time the general feeling was that it would be a poor overclocker. I wanted to update y'all to know that I (nervously--i'm a first time lapper) spent hours and hours sanding my 860 and Noctua NH-U12P SE2 cpu cooler all the way to a mirror finish with 2000grit. I was really surprised as I sanded the cpu how uneven it was even though it really didn't appear (to my untrained eye) to be.
I don't know if I just got lucky with a very overclockable cpu, or if I happened to choose the right combination of parts, or if this is a typical overclock, but the CPU has been completely stable at 4GHz (3960MHz) with a 2.160GHz memory clock. [I was completely stable at 4200.74MHz CPU/2000.35Mhz memory, as well.]
I hope my positive experience encourages some of you to try lapping -- I'm sold on it and will be lapping all future cpu/coolers.
Cool. Out of interest, what are the temps/voltages like? I would try lapping, but it gives me the fear. I'm a clumsy oaf, and liable to go straight through. I don't want to have to replace a £200 chip because I sanded through to silicon