GTX 580 or 660ti on a 500W coolermaster

[GTX karl]

hi the problem what I have is I have the money for either a GTX 580 or a 660ti the zotac model but I have a cooler master 500w psu and the card im running now is a gtx 460 at 160w but the 660ti is 150w but for the same price I can get a gtx580 but it requires more power at 244W so im not sure if I have the power to run the GTX 580

MY SPECS:
FX6300 4.1GHz
8GB team elite DDR3 1333MHz
1TB western green
GTX 460 1gb at 160W
3 120mm led fans
1 cd drive
windows 7 64bit
coolermaster500w


http://www.ebay.co.uk/itm/500W-Cooler-Master-Thunder-B500-B-Series-85-Eff-120mm-Silent-PWM-Fan-GREEN-ErP-/130962657271?pt=UK_Computing_PowerSupplies_EH&hash=item1e7dfb8ff7

 

[skalte]

I would buy the 660TI just because it's of a newer generation and I think there's some game bundles for it.

 

[GTX karl]

well im going for the zotac version for £170