I have had a Powerspec B818 computer for quite a while now, i use it mostly for gaming ( Specs found here: http://www.microcenter.com/product/340211/B818_Desktop_... [I have it dual booted with windows 7 and XP, i use XP for gaming]) and i wanted to upgrade the Graphics card. I was wondering what card would be the best to get without having to change my power supply?
the 7850 is a good choice, although if you think your psu is not enough then get a 7770 or a new power supply. however i think even a 500w of a generic psu is enough for a 7850, but if there is no six pin power connector then there is little choice but to get a new psu if you want to get a 7850. here is a comparison of the two cards http://www.gpureview.com/show_cards.php?card1=678&card2...
Dont use the 7850 with windows xp or any dx11 card, if you want to take advantage of dx11 supported games use the windows 7, besides some recent games don't support windows xp.
That thing xp for gaming is over, with the windows 7 any recent game will perform better even at dx9.