ENERMAX had its INFINITI 720W model running a box that included two Xeon 5130s, a SUPERMICRO X7DA8 motherboard, 2GiB FB DIMMs, a Promise RAID controller and 18 (yes, 18) 250GB hard drives. It's not a typical scenario, granted, but highlights just what an efficient PSU can power.
Discover more in this Computex 2007 Headline.