To give you an idea of how your machine will perform, I have 2.5GHz AMD X4 9850 processors and 8 gig DDR2 RAM. Everything else is about the same in your system as mine. I rund COD4 at full graphics. SH4 is played at full graphics. I just got Fallout 3 and I run that just about full tilt. Your machine will perform very well and the days of worrying if your machine will run game is now over for a very long time. Just load the game and push all the graphic to max. Have fun!