Also it's highly recommended to use dual cpu motherboards for building clusters, which doubles your processing power w/o adding much at all to the electric bill. But you probably are over estimating the power needs -- you don't need the drives or video or soundcards, so you dump those. When I build mine, I'm going to also get rid of the individual PS as well, use DC/DC converters and a central PS running it all off a 12v battery bank hopefully solar powered. Sure, for a university or business, clustering the already available desktop boxes would be the way to go (at least if you had a linux lab), but having even 4 dual 1ghz motherboards would be a fun toy. -- Harmon Seaver, MLIS CyberShamanix Work 920-203-9633 hseaver@cybershamanix.com Home 920-233-5820 hseaver@ameritech.net http://www.cybershamanix.com/resume.html