Most of the time the PC will only use what it was made to use. So if you get 2 GB, and the board only supports 1 GB, then thats all it will use (1GB). I think this because I was going to buy a MoBo and it read uses two 2gb RAM, but only 3.25gb usable.
maniaxzero.... I have a case similar to yours, but mine has 2 PCI slots (cant tell if yours does, and mine has all the ventilation holes on the side. I then have on one side 2 fans that pull air in, and on the other side, 2 fans that blow air out. I redid the insides though, my MoBo is in the same place, but were your M2-ATX is, I have my 2.5 hard drive, and were your hard drive is, I have my OPUS 320, which takes up so much space!!!! I have never ran the PC, since I decided to replace the MoBo and havent recieved it yet... but Im sure I went over kill with the cooling.... Were is your PC anyways? In the cabin, glovebox, trunk?