i got a Gainward gtx 460 gs for christmas , it said by nividia 450 watt minimum so i thought i might get away with it cause i have 450 watt that came wiht the case and i have not yet got a new power supply , i also got a noctua nh-d14, put it all in fine but noticed the power cable coming from the graphics to the supply had 2 sets of pins, and i only had 1 remaining place to plug into coming form my PSU, so is there a way around this or is it important i get a bigger PSU to run it cause wen i turned on the pc with just one set of pins plugged in it wud not bring any picture jsut said check signal on my monitor so will a 650 or maybe 750 watt be good ( just assuming a higher power one will have more connections coming out of it) new to building computers help would be much appreciated and advice on a decent PSU as i want to OC my i5-760 with the noctua nh d14, thanks in advance