The cooling performance is very good. My i5-2500K is @ 4.5GHz not much warmer than 55 ° C. Maximum temperature after 2 hours Prime95 was 58 ° C (measured by CPUID HWMonitor) at 27 ° C room temperature.
The only real Kretikpunkt is perhaps the size, which ensures that you can use on the first RAM bank only low profile RAM and perhaps more than the motherboard installed power supplies, the supply of fresh air this is going to suffer a bit.
The volume is comparatively high when the graphics card with an Arctic Accelero Xtreme III at 7V fan power / ca. 1000rpm is cooled, but this is still extremely quiet.
All in all, the cooler very good, but I had to put my memory on the 2nd and 4th bank because it was too high. For this circumstance, there is a star deduction.