Hello, I'm trying to run Vista 64-bit, through Fusion, on a Mac Pro 2.8 Octo with the factory 2gb of ram and it's horribly slow. I have 1gb allocated to the VM and 1gb for OSX and, without running any other programs, I'm essentially left with about 100kb of ram. Many of my cpu's also show >70% usage. I'm ready to buy some more ram, but I'm wondering about how much I really need to get everything to run smoothly. I am on somewhat of a budget so I can't exactly max out. My intention is to be able to use Autocad (no major 3d work, but some of the files can get large). Thanks for any help.