That PSU actually has a good number of amps and can deliver almost all of it's listed wattage which is a GOOD thing. But I think the quality is still pretty bad. I would suggest you upgrade to a Corsair CX 500 v2 just to be safe. A faulty PSU can take a whole system with it. THe 500W unit I recommended can run any card. The CX600 v2 is not that much more and you get about 100w more so it would give you a bit more breathing room. Never trust shop guys from Best Buy or something, they are just ridiculous.
EDIT: The 670 and 680 are quite efficient, if you are planning on running those or an AMD 7950/7950 then I would suggest you grab a CX600v2.
thanx but i have worst shop in the world (sa)
so i am buy it and i can't Return this power