I have Vista 5744 now running on this machine - Xeon 2.8, QuadroFx Graphics, 2Gb Ram, 160Gb SATA2 - BASE Score 4.5. It is nice and Aero is cool, Aero didn't work on my laptop. It's the machine that used to have 8 screens on it (twin Xentera GT4 PCI-E's) but I ditched them at last.