I have GeForce GTX 560 Ti. I's worked fine in 12.04 with nvidia drivers. Unfortunately, after todays 12.10 update, something broke down.
I've tried nvidia-current, nvidia-current-updates and nvidia-experimantal. Always the same behaviour: Bad resolution in lightdm, after logging nothing except wallpaper. No unity panels, "win" key doesn't work.
After removing nvidia drivers everything work.