There is a demo for DMC4 you should run it, what you consider playable may not be what i consider playable. but honestly, your rig will probably have a hard time running it, at least with the game looking halfway decent. You really should buy a new computer if you want to play some of the most recent games. Even if you tried to upgrade to the best components for your setup it would cost so much that you would have paid for a new computer.