Can i put another video card in this PC?

it does not have another slot to put in another graphics card so that's out. and if it did have another slot it would have to be sli/crossfire compatible. The only way a dual slot but no sli/crossfire config would benefit would be to run something like physx and the other run the game. ide recommend getting one big nice graphics card or buy 2 average sli cards, a new motherboard that has 2 slots, and put all your old parts onto your new motherboard. ide recommend just getting 1 new one though if your not savy with computers