It's a PIII... but I don't see how the type of processor would make a difference. I'm just looking for the case fan, not the one that goes on the processor. As long as it moves a sufficient amount of air out of the back of the case, I don't think it should matter. I have one with 2 ball bearnings in there now, and it's already making noise after 6 months. It's some middle of the line generic brand I think.
Thanks for the advice all! I decided to go with a fan from quietpc.com. They specialize in quiet fans, noise deadening cases, etc.... for recording studios and such. They have a fan that will run less that 20 db and full RPMs (not one of those temperature controlled fans).