On the ATI website, there's a review from CustomPC stating that the ATI MR 9700 hase a faster fps (frames per second) than the Nvidia Go 5700 Ultra. When tested using a 2.4 ghz processor, the ATI MR9700 had a little over 30 fps while the the Nvidia Go 5700 Ultra had only a little bit over 24 fps. So in my opinion, I would go with the ATI. To get there, go to the ATI website. Scroll over to Products > Mobile. Then go to Mobility Radeon 9700. Then on the side, theres a Quick Link and on it, theres reviews. At the bottom, it says what I stated here. But, also there's another, much better, PCI Express card coming out for Mobile laptops called the MR X600. I would say it can match to high standard computers today.

Unfortunately I can't access that CustomPC article. I wouldn't put too much trust in extracts that don't mention core/memory speeds, etc.