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Some 500W '80 Plus Bronze' should do it. Look at ones from trustable brands, such as Corsair or Cooler Master.

You can get away with a 500w power supply but I don't suggest a Bronze 80 Plus rating. Get Gold or Platinum so that you can save electricity. You don't really need a Gold or Platinum one since a 500w PSU will be 500w at the lowest though.

Replace that 650 TI with a 760 and you'd be a lot happier.

Finally someone who does not recommend an outlandishly powerful PSU. I just have to say thanks for spreading proper PSU information.

Multiple gigabytes don't mean anything when it's a single GPU setup...

thanks for link!

+1 for good link though it doesn't list a 7950 which is a shame since my powercolor 7950 was onsale for $300 when I bought it and it blows thru any game I put at it

I think the pin connects to the PSU if I'm not wrong, an GPU comes with cables to connect, your PSU just needs to be compatible, having a 6 pin connector I think, but about your processor buy this one instead "AMD FX Series FX-6300 3.5Ghz 6X", is one of the best for the money CPUs, cost 4€ more only at least in my country. Can handle without bottleneck a 7970 or 680, or 2x 660 or 7870.

Best CPUs for the money
AMD-FX-6300-vs-AMD-FX-4300