Every single graphics card on the planet is compatible with it, every modern graphics card that is. We need to know your PSU 12v specs though, how many Amps/Amperes/A does the 12v rail have?
Yep. 12a on the 12v rail.. Does it say anything to do with combined output voltage? Chances are it is a very low end PSU. I suggest you replace it with something better to not risk anything blowing up. How do you feel about it?