I can tell you I notice a difference with 7 being faster. Albeit nothing huge. the biggest difference is memory. with 8GB, booting into Vista 64 Ultimate, I'll get 26% used automatically, where as 7 ultimate is around 15%. For gaming though, you'll notice a small percentage increase, but it's not going to make anything playable that isn't already. 7 is a much better OS IMHO though