Can i mine it with nvidia?
Yup, and you can beat the AMDs easily. I have 4gb Gtx 680, I can squeeze 4.5Mh/s easily. The newer cards have much higher hashrates, you can check them from the cudaminer topic:
https://bitcointalk.org/index.php?topic=167229.0ya but honestly that does not mean anything.
what matters is what the performance is like and what does it say on the pools..
pools calculate your hash rate on what your actually doing and it has nothing at all to do with your hash rates
pools have no way of knowing how fast your hashing (in case people don't know)
for example i created a cpu miner mod that cuts out some of the heavy / costly groestl hashing (for a public beta test only)
did this by dropping groestl if it's going to get run more than once.. if so ? drop the hashing and start over and ask for NEW work.
and that pushed my 500ks/ cpu to 2.2mh/s
but that is not what the pool see's

and technically i am hashing that fast but it does not match the pools algo basically so..