The average stock dell power supply is never more than 350 watts, and meets the 750 ti amperage requirements. With a reasonably decent processor like that, I would think, that if you have the money, buy a new power supply perhaps 550 watts and get a graphics card that can take a six pin such as a R7 260x As long as you have a mid tower case, or what ever the current word on the street is for the mid atx sized tower, it will fit. If not, then get the 750 ti, as it is a very nice card and requires no six pin.