I've recently completed my Sandy Bridge build, and am starting to overclock the processor.
First results using the stock cooler had the CPU comfortably running at 3.6-3.7GHz under Prime95 load, and first results with the H60 have it running at 4.0-4.1GHz. The ASRock board is currently 'auto' overclocking the CPU, as I have it set to boot the CPU at 4.8GHz with automatic adjustments for voltage and SpeedStep. This results in the CPU running at 4.8GHz on the desktop during brief loads, but throttling down to the above 4.0-4.1GHz during sustained loads.
My goal is to get it running at 4.5GHz or more under sustained loads, keeping voltage as close to stock as possible and not exceeding 110% of stock voltage.
My secondary goal is to get this thing quiet. The H60, while fairly quiet, is now the loadest part of my system- I think that the intake filter I put on it is adding to it's noise profile, but I'd like to see if I can't get it to lower it's fan speeds. I'll have to balance heat output and fan speed to keep it stable; that's what I'll be discussing in the future as I have more opportunities to work on it!