Not the best idea to build a computer off of a server obo cause no Os can recognize more than 1 CPU, it has no normal PCI unless PCi will work in a PCI-X slot, that mobo costs more than my entire new system, and your current system is pretty good exept you could go up to 2gb of RAM and if your 6600 is AGP you can go ti a 7800Gs if you have enough money to spend on that mobo.