I trying to get set-up to run a CPU-intensive program(MacSpartan-a Computational Chemistry/Molecular Modeling program). Unfortunately, the version I have uses a hardware key for piracy protection. The hardware key plugs into an ADB port, and so I'm stuck with using a computer that has one(I could not get it to work with the Griffin iMate). With that criteria, I think that a B&W G3 is likely my best option, but would like to explore upgrading to some sort of G4 processor, or at least a higher spec G3. I've seen the at everymac.com http://www.everymac.com/upgrade_cards/by_system/powermac_g3_blue.html But am wondering if anyone has experience with any specific upgrade. Since all of these are long out of production, availability is certainly going to be a consideration, as is cost. Thanks in advance for any help or advice that anyone may be able to give.