The Stanley Blower fan. I used one to help cool a 4 card rig in my CLOSET. 2x5870's overclocked getting about 440mh per card and two 5850's also overclocked. It kept the cards well below 75c. Without them the cards could hit over a 100 if I let them. They would throttle down before then. But That fan is amazing and its not too loud. Pushes a LOT of air.