You don't need the 2GB of ram, but all the alpha gamemakers I have seen, have used the 1Ghz mpu (and typically not the one that is expandable to 2gb). The control board on my game maker is attached to the metal plate on the door. The molex is for power and connects to a harness that goes directly to one of the backplane's aux power plugs, it is a straight pin through harness. I have found that OS 33x works best, although it is supposed to work with a variant of 32x, but I've issues using that, so I only use 33x now. Photos of door attached.