I had to roll back to the previous drivers as well. The 310.70 drivers did not like Psychonauts and Spider-man Web of Shadows at all. Horrible slow down on both games and Psychonauts became unplayable due to it crashing every 10 minutes. When I did the install of 310.70 I did it with a clean install and removed all the older drivers first, so something is definately borked with the new drivers.
Tribes: Ascend is effing amazing. been a long time since I've played an online shooter that has stuck with me. I choose to spend 20 bucks on the game to unlock some characters and some 1 day boosters since I figured I'd support the devs if I'm going to sink more than 15 hours into the game (which I already have)
Come join open beta! Game is fun and Skiing is about the most awesome thing ever.
*note: I had issues with Nvidia graphics driver 295.51 (game would crash before it got to log in screen) and updated to new beta drivers 295.73 and issue has been fixed. Found this fix on their official forums.