I am running OSX 4 on a PowerMac G4/533 with 1.5gig ram and an iBook G3 600 with 384 ram. The G4 is obviously faster, but both work well enough. I have found a number of programs I wanted to run required 10.4 and would quickly recommend it over the older OSXes. Hard drives are cheap and are not Mac Specific. I put two new 80gb drives in my G4 for $55 each (I mirrored them is why I got two). You can upgrade the CPU, but not to Intel. I was thinking of upgrading my G4 CPU but figured I would get more bang for my buck putting that money aside and getting a G5 or Intel later. You can get a new Intel powered Mac Mini for $500 from CompUSA, some of the CPU upgrades are half that much or more. Have fun learning a new world. I sure did. > I'm a Windows XP user that just got an old Mac with the following > specs: > > - 400Mhz processor > - running OS X 10.2/Jaguar? > - 384 meg ram--expandable to 1.5 gig via 4 slots of PC100 > SDRAM mem. > - 10 gig drive--7 gig free