600W would be overkill. As guggi said you would probably scrape by. Personally I would get the Seasonic ECO 500W or the XFX 550W. It will be future safe.
the power supply can handle its a 110 watt card cpu 77 what mother board they are usual 75 some can come at 125 watt include 100 watt for extra components and hard drive =362 watt total power supply outputs less that input depends on the efficiency it should do 125 watts on extreme gaming motherboards
really, a well 430w unit is perfectly fine. ~80w cpu, ~110w gpu, ~75w rest of the system = <300w at full usage. dont waste your money
Well, like I said, he would probably get by, with his CPU and the 650 ti along with the rest of his system he's only pulling less than 300 watts,yes,so he should be okay.
The recommendations for 500w are a bit over the top, but they are recommendations for a reason!