Let me try... YES. You will notice a speed difference. Since it is half the speed of the G3 system bus, I would say it would be at least 25% slower. Maybe even half, but I doubt it would be half as slow since you are running an upgrade card in the 9600.. (although when the g4 got a 133mhz system bus, they said this alone made it 33% faster than the older 100mhz sys bus) I would (and I don't know what else you are running on the G3 ) install the 001 in the G3 and use the 9600 for office stuff. Maybe even use it to run midi, or a samplecell, and use the G3. I have a G4 400 my partner in business (music) has a G3 450. We get IDENTICAL performance. BUT both machines have that 100mhz system bus. You need to ask yourself this question.... How serious about audio/ptle am I? If I am planning on getting as wild as I can with it, I would go G3. If I just want to use it to record small stuff, clean up old recordings, maybe doing voice overs,don't plan on using plug ins, (or at least not a lot of them) the 9600 would be good. What do I use the G3 for the most? If the answer is surf web, email, word, excel, etc. I would use the 9600 for that. If you are doing video, or photoshop with the G3, then of course it is going to need the faster machine. Hope this didn't confuse you, and I hope I was actually answering your question, the others seem to have missed the boat... FWIW 