Thank you Bruce.

Yes, you're right about the colors. The 450MHz G4 is actually grey with a blue face, not white. You wrote:

"Here's how to tell the G4 systems apart:

<http://support.apple.com/kb/HT3082>"

A great page for G4 owners.
It sure helps to know what one has... We are comparing a PowerMac G4 (AGP Graphics) and a PowerMac G4 (Digital Audio)

Concerning the Graphic cards, I did swap them and noticed additional pin outs on the MX card out of the Digital Audio. Swapped them anyway and both machines functioned. System Profiler read the hardware correctly. Of course, a stub of pins had no socket to plug into on the AGP machine.

Am I wrong to believe that faster and cheaper video cards are available for the (grey) Digital Audio G4 since the later G4s like the QuickSilver will fit a NVIDIA GeForce2 MX card while the AGP G4 won't?
<http://support.apple.com/kb/TA25585?viewlocale=en_US>

Why was the Digital Audio named Digital Audio? Was it about the audio input device (third party); or different hard drive capabilities?

I'm not much of a salesman so I'll just use the grey for troubleshooting and back up. My PPC 7500/XLR8 is still an old friend which hasn't failed me.
Thank you, Roman
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