I can hardly wait to upgrade to a ATI Radeon 9500 XTX and do some real folding: crunching 1WU in 5 minutes!!
At 2.7 GHz you will crunch a lot of work units.
The X1950 XTX with 512 MB is supposed to be a real barn burner, and the 48 pixel shaders work in parallel when folding.
Those cards will average between 550 ppd and 660 ppd. One of those cards at full speed can replace all of my home computers as far as points earned.
Five drives? Are you starting your own private Blockbuster? Or just trying too see what a 1000 watt power supply costs?