Bar81 most common reason are Hyperthreading, pci-e, upgrade path etc. You already have a nice system I have a crappy system and want newest for my upgrade when I do it. I am running 1.333 GHZ Asus A7V133... Three identicle system and I wanted to upgrade all three systems but the intro cpu just too high for me so I may have to settle for 754 on just one system and wait till Jan 2005 to upgrade everything to 939 etc. I wont upgrade anything untill I can finaly buy a 6800GT and then I will make my decision. I always have the same mobo and less ram and slower video and slower cpu and stuff on the other systems but want the same mobo on all for trouble shooting.