I really want to upgrade to a Radeon Hd 6850/6870, but I'm not sure if the card is compatible with the AMD 780g motherboard the computer has, or if the card will even fit, as I know graphics cards are getting larger and larger. I want to run games in as high a setting as possible, and I've seen these cards in action on friend's pcs, so thats why I picked them out. If theres another option that would be better, I'd like to know for sure. I've already swapped the psu out with a 600w psu, which I hope is fine. I'd really prefer to just upgrade this pc as I'm happy with everything else it has. Thanks for your time!