If you're looking at other air CPU coolers, stop now please, because this is the one you're looking for. It's worth every single pence. At idle, it keeps my i5 3570k @ 4.2GHz at around 28-30C. And at moderate load, it goes to about 40C. I've never seen it above 50 but I have to keep testing it. It is rather big, so do make sure your case is wide enough to support it.