Vista+ allows the hybrid SLI configuration that nvidia put into some Macbook Pros to work (those with both a 9400 and 9600GT card). However, the Apple firmware does not allow it and the end result is random system freezes in Vista+. After nearly a year of experiencing this bug myself on an almost daily basis, I finally came across a solution. Been crash free for about two weeks now.
http://www.ocztechnologyforum.com/forum ... hp?t=54536