You would simply require a [expensive] G4 ZIF socket upgrade card for this to work, oh, and be sure you have the Royal VRM, not the bad one... the VRM is this square module under/right of the personality card, if you have the correct version, it is greenish, not black, and the little "life saver" thing on it is perpendicular to the board, not parallel. The thing with the older VRM is that it can't supply enough voltage (or something like this) to the G4 processor not allowing it to work.