> Mine is the Mac G5 version with 256MB.
As far as I know, there never was a Mac G5 version of the X1900XT, just of the X1900GT. So what you might have is either an X1900GT or an X1900XT re-flashed with the X1900GT PPC ROM.
Maybe. At least it is running, to bad, it is not one of the compatibles.
System Profiler says Radeon X1900 XT (vendor 0x1002, id 0x7240, ROM 113-A52070-109), and the card works with 10.4 and 10.5.
Vendor database says it's a R580.
Too bad, if it is not going to run MorphOS. At least it is faster than my Nvidia7800GT.:)[ Edited by amifrog 22.11.2019 - 09:47 ]