They both have variable 92mm fans so that the RPM increases/decreases depending on the CPU temperature. I have the OCZ Vendetta and I'm pushing 3.5GHz. I recommended the Freezer 7 PRO as well because it's supposed to a brilliant price to performance cooler and a lot of people are very happy with theirs. If you want a super-cooler and maximum overclocking potential then the Tuniq Tower 120 is very good.