> So for a 500MHz iBook, how high could I go with a new motherboard... the > 900MHz/G3 model? A G4? Or only a 600MHz/G3? What will the design of the > 500MHz model allow? The size of the logic board changed at some point, so you may need the frame from a later logic board as well. I think it changed around the time of the opaque 700s. The mounting of the optical driver differed, but I think the drill holes for the earlier brackets on the later frame, not 100% sure, but I'm stripping a 700 later so can check that. No idea about G4s. -- Best wishes Malcolm Cornelius - The Powerbook Fanatic http://www.pbfanatic.co.uk