First, no one can tell you without knowing your resolution. The above numbers are to high for 1080p. But you can just go read game and gpu reviews instead of asking here. you should be able to play on ultra above 30 fps on pretty much anything, which is plenty.
2ND raidmax makes junk and if at all possible you should return it and get a decent PSU.
The best "cheap" power supply is the Antec VP-450W. It'll run your GPU, and is only $35. Rosewill makes bad PSUs. If you feel you need the extra wattage, the XFX 550W is a really good pick.
The frame rates I put up range from resolutions of 1600x900 to full 1080p, I got them from actual people uploading videos of ultra gameplay at ~60 fps. I think only one of them wasn't 1080p, but either way, they're really good framerates.