Ok, I had to change something so I had the cover off and took a closer peek inside. It's got, if you're looking at the front:
upper rear right side, two empty spaces labeled Ram 0 and Ram 1, used for anything?
middle right side, two vertical rows with 8 Toshiba chips
7 horizontal slots right below the vertical rows, what kind go in that?
and a long slot labeled Fast Slot right next to the front right of the Motherboard, what's that used for?