I know there is shared ram in this system. I have 4gb of Mushkin Ram installed I can see it on the post screen it looks like it says 3gb usable and 4gb installed? The OS says 4gb installed and 3gb usable. It is windws 7 64bit. Any ideas? I know the video shares ram but I didn't think it took a whole gig. I set the video buffer to 512.