I am not an enthusiastic person, but I really have to sing the praises of lapping your heatsink for a quad core CPU especially if it's slightly convex to begin with. Running the system in my signature with that 1.25V recorded from Everest under load, my temperatures dropped 15-20 degrees Celsius across the four cores from two hours of lapping. They went from 63C-72C to 48C-52C under large FFT's in Prime.