1 (2GB) of DDR2 Ram could probably cost ten times more than 16GBs of DDR3 Ram
... that is also one of my problems, I want to upgrade but I would have to upgrade to a whole new gaming rig.
But yeah, you may be able to play the game (I take it that was the Demo you played?) but it will have to be with med to low settings. Pray that if the game is a console port, at least they do a good job porting it.