Hm for what i know the most good crypts dont work on nvidia, and if it works it dont goes well. Only for what i know whas x13 what runs nice on nvidia.
Problem is, most people are using ATI for mine altcoins, so the devs focus on ati miners and not nvidia.

I tried a search on google, but i also could not find it. What u can do ( i did that in the past with nvidia ), try using sph miner for ATI!! i mined many darkcoins with the X11 mod on my previous nvidia cards. So it could work if ur lucky..