I would like to know how big of a PSU I need to run a file server. It will have 7 SATA 320gb HD's / 1-DVD-RW drive/ USB multi-drive/ 6600gtoc AGP/ 4 TV Tuner/2x512mb DDR and a Hardware raid card-5 case fans(120mm) CPU-3.4ghz Northwood S478. I've been using a Antec Truepower 550 watt; but it does seem to be powerful enough. I get the not power connector to the video card intermediately and a I lose the same drive on my array! I tested the drive and its okay. I figured 550w would be enough.