All of my MDDs support 1Gb DDR up to 4GB in each motherboard. The actual issue is Mac Os 9 not using over 1.5 Gb.
It's well know that Apple continued to upgrade Mac Os via "Mac Os CPU Software" upgrades. The very last One is Mac Os CPU 5.9 and we proudly are the only know source of it.
About AGP-16x graphic card using 3Gb of motherboard RAM ...
It is very poorly argued, and without real 2D/3D acceleration i am afraid that is useless.
About Mac Os 9 and G5 hardware only note that last versions of Mac Os 9.2 runs somehow in G5 Macs, in Classic environment.
So nothing new up to here.
Yes, I have 2 MDDs, and I'm fairly positive they are the 2002 model. And yet, I just successfully used 1GB sticks on them today to test his theory, which seems, so far, to be incorrect.
There is a lot of great content shared by SkyCapt on MG, and he's a nice fellow overall, but one always needs to look at it with some skepticism and filter out validated truths from all the assumptions. So the MDD "differences" and calling his MDD a "G4/G5 hybrid system" is one thing... But some of the rest may have real meaning, like the alleged Jaguar performance gain,
if true. I would have to personally check it to be sure. But, since Jaguar, especially on a pre-G5, is of no interest to me, that won't be anything I'll pursue. Every pre-G5 should be running OS 9 anyway.
And even
that only while G5s can't boot 9. (Let us dream...)
Nonetheless, that's a lot of interesting experimentation he did, really awesome stuff. It makes you wonder... if you could do the opposite, and poke at early 1st gen G5s with OF, have only 2 GB RAM max on them, and try to make it report itself as a G4 PowerMac (i.e. MDD's ID), and a G4 processor (7447a?), force screamer for sound etc., then try to boot OS 9 into it.
Maybe with some extra hacking and voilá, magic! (Ok, I'll stop...)
Edit: Got processor name right (7447a).
Edit 2: Just caught up to
this thread.