I'm using the freezer 7 pro and it works pretty well on my Q6600. Currently in my hot room running at 2.7ghz I idle at 45, 40, 39, 44 and go full load to 58-62 ish. I took my computer to my cool basement and idles dropped 12* each with the same clock, and I clocked it to 3.2ghz with idles still lower then the ones in my hot room, but it wasn't stable under load(core 0 and 1 don't like OCing) Its a nice cooler though.