AMD Aircooling Round-Up of 2003
JMke writes: "If you want a silent AMD system you almost always have to get yourself a higher-class heatsink. Thermalright and other manufactures have brought out updated products that can keep your CPU cool while keeping the noise down, hardware geek site Madshrimps has published a roundup of the best heatsinks from 2003 that money can buy in 2004, read it here."
I also remove the sheetmetal plates that block off unused slots, and try to use only every other slot.. That lets air blow out in between the expansion cards, preventing a dead air zone.
I use only one 7 inch or 4 inch AC case fan (in a hole cut right thru the face of the case, with a guard on it made out of hardware cloth) at low speed to blow air into the case (I reduce the speed with a small AC capacitor (like used for AC motor running) in series with the AC fan). I blow the air into the case, not draw it out, because I don't want to fight against the powersupply fan.
If you have a lot of fans, the tone from each fan can work together to create what is called a beat frequency, like the complex tones you get if you pluck two or more guitar strings at the same time.