Masscool 90mm Ball Bearing Case Cooling Fan is what i put on my PIPE101. It is pretty quiet and moves a decent amount of air. And I did have a tornado on my heatsink for about 20 mins before i took it out. The only thing to make note of is that most case fans have large screws to mount to the case and not a HS. I had to go to home depot and buy a package of screws for $1. Just be careful cause the PIPE101 uses soft aluminum and the threads strip easily as i did that on one of the holes. I have a prescott 3.4ghz and that fan/HS plus other fans keeps processor around 45-47C at idle.
