It costed him about $400 and gave him a very silent computer:
This rig has been running successfully since 8/06 (knock knock). Computers have been easily swapped out without the need to shut down the pump or any other computers on the line. There is no perceptible temperature difference in the water returned to the pool. However, every machine on the line happily operates somewhere between 30 - 40 C depending on the water temperature. Most of the fans in each machine have either been removed or disconnected making it much quieter. Additionally, the entire room is cooler without the need for air conditioning. Success!