Great Cooler, Replace fan,
This review is from: Corsair CW-9060001-WW Hydro Series H40 Hydro CPU Cooler (Personal Computers)
I have my i5 3570k overclocked to 4.4GHz and this keeps it nice and cool under load.
The only downside is the incredibly noisy fan. i replaced it with the sp120 quiet edition and now runs silently.