I have a Dell Optiplex 9010. From the factory, it came with an AMD Radeon 7570 and a 275 watt power supply.
I keep reading that the 7570 is simply a renamed 6570 that Dell uses. And it's locked to Dell drivers, which haven't been updated in forever. I've tried all the hacks to get around the Dell drivers, but can't get the AMD drivers to load no matter what. I have issues with the card occasionally, and Windows will occasionally say it recovered from a graphic driver failure.
Yet the 6570 (On AMD's site) says it requires a 400w power supply. The Optiplex 9010 never came with a 400w power supply.
I'm not a gamer, but do run two 23" LCDs over DVI for work. I'd prefer not to swap out the power supply too, but will if I absolutely have to. I'd like to find a card that would work for my needs. Everything I'm finding needs too much power (Or they're making it up since apparently this card runs fine over 275 watts.)
Extra points to anyone that can get the the drivers of my existing 7570 updated to the latest AMD! :)