I just wanted to share my results using the Antec 620. I am running an i7 920 at 3.9Ghz with 1.275V which idled at 50°C and would hit mid 90's after several minutes in Prime95 with my dinky Arctic Freezer 92mm cooler. Having installed the Antec cooler, I am now idling at 38° and after a full pass in Prime95, the hottest core just hit 70°C. I must say I am pretty happy with those results. The fan/pump is super quiet and relatively easy to hook up even though the included instructions are basically worthless. Hopefully now I can finally go over 4.0Ghz without worrying something is going to melt.