Computer is up again. New power supply, this one cranked up to 750W, and with a huge-ass cooling fan. Also added a new cooling fan to the case, and made one other little addition:
Yes, that is almost 2 Terabytes of RAID0. That's 4 500-GB drives in an array.
We'll discover soon whether it will allow the playback of uncopmressed 1080p AVI files.