Upgrading a Gateway sx2800-01

I just bought a Gateway SX2800-01 and want to add a quality graphics card to it. Is there anything i can run without replacing the PSU that will alow me to play games like ARMA 2 for instance.

220 watts, Gateway, and im not completley sure on the amps, i know the power required for a decent graphics cards is at least 350-400, like for a 9800 gtx and such.

right, thats what i thought, any suggestions on possible replacements, the research i've done has yielded little results because it is a slimline pc, so many psu's wont fit in the system

for the half height aka low profile this woul be one of the best cards (if you have SFX PSU an get the SeaSonic)

SAPPHIRE 100253HDMI Radeon HD 4650 512MB (an this really isn't that strong of a card, then there are heat issues with slim line cases and Discrete GPU's)

though do you have a pci-e slot, if not you really on't have much of a choice

it almost seems better just to wait, save some money, an build a custom box, doesn't have to be 2k or anything, $750 would be plenty

never mind that concept was disbanded by ASUS... in early 2009

We just had a few threads similar to this one involving Dell and HP slimline cases with slimline power supplies. A 300 watt slimline psu is about as good as it gets in the USA. Your Gateway model has a 220 watt power supply and is only 4.2 inches wide so you'd also have to install a low profile video card.