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Even for runing a Gtx 280, a good choice for a psu would be a 520-620hx. It really depends what price you find them at, if you can find a 650tx it a low price that would be great as well, same for the 750tx, but the 750tx is a bit over kill. Under the specs of your computer it would probably say, or you can take of the sid panel and look at the psu to see if it says atx anywhere, or you could just link me to your model and i can tell you.
net jockey, that 750tx that is powering your rig is Soooooo Sooooo overkill, a 450vx could easily power it. Easily.