I'm drooling at the mental picture of a multi-cpu xeon-based machine.... I have a source for some xeon CPUs at about 600 MHz
Where can I find a system board to suit several of these? Do they need special PSUs? (probably depends on the board and the number of CPUs) What is SWTX as a board form-factor? Probably most importantly, how well would linux run on a SMP xeon?
