I'm running the 190.56 drivers with TH2GO at 5040x1050 (GTX 285). In fact, I *couldn't* get the 182.50 drivers to work.
The link to the 190.56 drivers was on another thread here. They're basically an OpenGL 3.0 development branch off nVidia's driver line.
Yeah I got 2x 285 cards using 182.50 drivers suck ass compared to my mate's similar setup playing other games in sli mode.
I think I did try something that was not the official nvidia drivers but ended up sitting for a whole 2 hours just to revert back to the 182.50. In my opinion again we should just be able to download clicky and boom new drivers and 5040x1050 display resolution and no fuss.