Keep in mind that I think the ROM is on the CPU card, not the logic board. Hence one of the reasons people who did upgrades wanted the old cards sent in. So it may just be the processor module if it is the ROM. I could've sworn (and I made a topic on it) that the logic-board was just the PCI bus with pins from the CPU Module going directly out to the bus and power.

All the chipset (Except cardbus controller) and video is on the card.