I use an Alpha PAL6035 with the Sunon 30cfm fan, which is not loud on my Tbird 1.2Ghz CPU, which I can overclock to 1370mhz without overheating. It works very well, but case cooling/ventilation is very important too. The fan that the Global Win FOP38 comes with is very very loud, so unless your computer stays in another room in which you can close the door to, don't get it. The Alpha will be quiet and cool at the same time. I bought 4 other heatsinks first before I got the Alpha, and none work as well.