OCZ ModXStream Pro 600w.... could i run a gtx780?

ive had this power supply for about two years now... currently have a 2500k@4.8 and a 7950@1150core/1575mem... plus a 2tb wd green hd and a 180gb intel 330 ssd and a bluray burner, 8gb ram etc. on a z68... everything runs fine.

reviews on it were decent and it was really cheap at the time.. i think like $40. its rated as follows.... +3.3V@25A, +5V@25A, +12V1@25A, +12V2@25A, -12V@0.3A, +5VSB@2.5A

can i run a 780 with this. does the 780 draw as much power as the 7950? what about after overclocking? thanks yall.
 
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I know i meant it mpre towards quality than efficiency wise. If that psu is two rails i wouldnt trust it vs a decent single rail psu
i have 4 1200 rpm 120mm case fans plus a noctua nh-d14 so im sure that eats up a little bit of wattage. i had a gtx570 oc'ed early on and it had no problems. im guessing the 7950 is probably about equal to the 570 amp wise with both overclocked. from what i see the 780 is 250w but my power supply has two rails at 25amps each... not a single rail at 50amps.
 


Efficiency rating has nothing to do with the DC output since that is what the PSU's are rated at.
It will only affect how much they pull from the wall! A 600watt at 80% efficiency will pull 750 watt from the wall at max load but at 85% efficiency only 706 watts.
 



I know i meant it mpre towards quality than efficiency wise. If that psu is two rails i wouldnt trust it vs a decent single rail psu
 
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