I'm using 6 gigs of ram with Vista 64 bit. It says 6 gigs in the system info page. However, according to my RAM usage counter provided by the OS I am using 22/23% of RAM just when I start up. Does this seem high? Also, when I go to the Task manager, it reads: 6 gigs but only 4 or 5 gigs are cached. Is this a prob?