I have severe doubts about this being the total system memory consumption as it seems way too low. More likely that this is the RAM consumption with the same or even bigger amount of memory pages being in the pagefile.
I have 3.6GB committed right now on an 8GB machine running some Outlook, Firefox and a couple of utilities. I find it hard to believe that SWBF would consume only 3GBs more as most modern games I've seen tend to consume somewhere between 8 and 12 GBs by themselves, without the OS.
OS can "use" 0GB - means that it'll just swap constantly as it'll be using pagefile as "RAM".
Really? Could you post proof because I honestly don't believe this. I think the only recent game that could go over 8gb is JC3 because of its massive memory leak. I don't think I've ever seen a single game go over 5.5gb. ROTR holds the crown atm.
BTW firefox is a massive ram hog. It's currently using 1.6gb with only 6 tabs.