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I have an older HP Pavillion e9290f. The link has all the specs, but so you don't have to click, it is a core i7/920 with 9GB PC3 8500, and an Nvidia GTX260/1.8GB. It has a 460W power supply. It is completely stock.
I am looking to upgrade the video card, even if just a little, and still keep the 460W p/s. I do have a 600W p/s (I think it's an Antec) but I'm not sure if it is compatible with this motherboard. I'm also not really looking to get that burly of a card that would require a 600W p/s and I don't want to worry about insufficient cooling.
While I am looking to get a good deal, price isn't the primary concern. My concerns / criteria for the card are, in rough order: