Need to remove the motherboard to install
Simply a silent extremely efficient CPU cooler. Since install my temps (overclocked XP2600 running at 2.25Ghz) remain consistently at 40c in idle whereas with all previous coolers my temps remained in the high 40's. Under very heavy load the temps rise to 48c however never move a degree higher. My case is relatively small with only one low speed (silent) case fan in place.
Heavy, don't move your case around!
I bought this thing from silenx.com for 35.95, looked like they had the lowest price around for it. I wanted to make a quiet computer so I used the zalman heatsink along with a silenx power supply and I must say, wow. My system is running quiet and cool and I don't have to sacrifice performance or stability! It's quiet heavy and bulky so you have to make sure there's enough clearance to install this sucker, I had to bend a capacitor just slightly to make sure it installed properly. I don't have a noise measuring device but it is definitely quieter than the stock heatsink, which should come as no surprise.