Ya it really just sounds kind of fishy, if it came with a 7800gtx then where did it go, sounds almost like he dissasembled the comp and is selling it off in pieces. And like the other one said, x300 are very weak cards, you can't really produce a lot of heat with those cards if you tried. It just doesn't seem completely legit, its gonna not be much cheaper in the end and really not worth the hassle.