>I guess you mean "PPC ROM" here

Not really, the card has extensions/hooks for OpenFirmware.
Is it a "PPC specific ROM"?
Yes, but just like a PC's video card has extensions to its bios, so does a PPC Mac.

"when using a PCI-Express graphic card, we sugges
t to use a Radeon HD2400 or newer
models. Older models like X600, X800 are not fully
compatible with the Sam460ex and may
not work. Some X1550 cards are reported to work OK"

weird. no explanation.

[ Edited by Jim 05.03.2014 - 15:24 ]