I have recently decided to buy a new GFX as the one I have currently is getting outdated rather quickly with new games and software. I stumbled across the GTX 770 and feel that it won't cope with my PSU. At the moment I don't know my specs on my PSU but I knows its a Enermax either a 480W or 500W. I am hopefully getting a new one around the new year when I get some more money as Christmas is over. Can provide a dxdiag if needed.
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More aboutevga gtx 770 run fine 480 500w psu
chances are that you will need a larger psu. I wouldn't go with anything smaller than a 600W PSU from a quality manufacturer such as Seasonic, XFX, Corsair (not he CX series) or Antec.
As long as the PSU has a maximum combined +12 Volt continuous current rating of 37 Amps or greater and has at least one 6-pin and one 8-pin PCI Express supplementary power connectors it should be sufficient.
Sorry its late but thanks for the replies etc. I bought the EVGA GTX 770 with a Corsair 750w PSU and it is running completely smoothly.