I've got one as a server and it's got two DIMM slots. I put two 256MB DIMMs into it and it works fine. It's a 845 chipset with integrated graphics and no AGP slot as you've found out. If your games are particularly old or basic then it should be fine but otherwise you've got no chance. It does have some PCI slots so I guess if you really want then you can try to find a decent PCI video card.