If you have a dual boot option xp or vista 64 and a game is only direct x 9, which operating system would be the best to use? I know that even a directx 9 game running under vista requires more memory. The Witcher , for example under recommended specs running in Vista requires dual core cpu and 2 gig of ram. Minimun specs in xp are p4 single core @2.4 ghz with 1 gig of ram.