Hi. I was thinking of getting the new gtx 750 ti sc for my hp mid desktop computer. Model of the computer is the pavilion 500-123w. I know the graphic card is compatible with the mobo but im not so sure about the power supply. I have a stock 300 watt that came with the computer and im sure that its less than 20 amps on the +12 volt rail. Although, i just want to know if the card will work with my current power supply. Thanks