I recently built up a big machine with an Intel Quad core processor, 8GB of RAM, and Vista 64. I then installed Sony Vegas Pro 8.1 on it. It’s about 7 times faster then rendering with my old laptop with 2GB of RAM.
However, it locks up incessantly, and randomly. It may lock up while the splash screen is still displaying. Just never finishes loading. Or it may lock up when I click the Pause button while previewing something in the trimmer. Or it may lock up when I click Play on the main timeline. Or I might go to dinner while it is just sitting there, and when I come back and try to do something, it locks up. Pretty infuriating to have to do a SAVE every time you do the slightest thing. And constantly having to load the Task Manager to blow the thing off and start over. Arrggghhh.
Other than this one application, I have to say that Vista 64 is much more stable with 8GB than the 32-bit OS was.