Just as helpful info for people going to use similar machine.
I managed to install debian on it - there is some messing with boot-loader - as installer is trying to do it MAC way and expects formatted boot partition,
We need to have raw boot partition with boot-loader image dd'ed to it. everything works fine than.
I hope they will be able to fix it quick since its nothing serious.
Ofcourse it is nice to have some modern graphics card - the IBM issued matrox G-450 - does not work (bug in the matrox driver on PPC platform) neither the expensive adapters. Anyway they were so rare and designed with specific application in mind that there wont be much joy anyway.
Good news: old good Radeon 7000 - PCI PowerMac version is fully supported by this machine from boot-time - console support - basically 100% since it has OpenFirmware ROM. No hacking required, no boot-time mode-setting, nothing just plug-in the card and select it as the active console (do it manually form sms menu). Sourced on ebay for 15$.
So yes Radeon 7000 Mac edition is fully supported on on IBM Power
works, everything else works fine - this is very power-full workstation now. I find AIX to be more interesting but.... try to watch a video on it
or try to use the sound card that was sold with the machine, With aix I could only use it as file server or FTP really. Its like having Ferrari but being only able to look at it running idle
I will be happy to answer any questions