Our 15" G4 1.5 PB lost one of its memory slots, or at least that appears to be the case. It now has only 1Gig of memory, and I'm running the latest version of Leopard on it. At this point, it's only going to be used for light duty, but would it make more sense to run 10.4 on it since I recall that 10.5 is a memory hog? Any thoughts would be much appreciated. Thank you.