PreviouslyI had a 7900 GTX and 8800 GTS and found the performance was worse with two cards on Vista 32bit (5 wows, 8 gigs ram, AMD Phenom 9950, raid 0), so I just left the 8800 in there and went with a single card for quite a long time. After a recent thunderstorm (non-shaman), I thought the video card was nuked so I put in the old 7900 GTX, but as it turns out the original card was ok so I stuck them both back in for shits and giggles now that I'm running on Vista 64 and the performance FPS wise is exactly the same however overall my system performs slightly better. This is noticeable when exiting 5 clients at the same time which is instaneous now. I'm guessing the extra video cards ram is being utilized instead of system ram when things get heavy, IIRC there was also vista fix with the second GPU not being utilized properly but in any case there hasn't been any fps increase.