what size power supply do I need??

[Jmorales2803]

im upgrading my card to either a Sapphire toxic 280x or a NVidia 770 4gb version but my current systems power supply is only 460 watts. what size should I get that isn't overkill???

 

[IAMEXTREME]

500~600 watt

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: SeaSonic G 550W 80 PLUS Gold Certified ATX12V / EPS12V Power Supply ($83.98 @ SuperBiiz)
Total: $83.98
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-05 22:05 EST-0500)

 

[Jmorales2803]

guessing my 460 wont cut it

 

[IAMEXTREME]

guessing my 460 wont cut it

It will not.