A gts 450 or a 5670. I suggest that you go for a cheap 5750 or 5770 and never look back. They will run on your psu but it will be pushing it knowing that what most people is cheaper than a ordered out pizza and very poor quality.
Yeah, what is the brand/model of the power supply?
brand is supercomp... a local one i guess...
i dont know much about PSUs , so I will check it out, and then tell you guys info as you ask for it