PCI-express video board question

I’m trying to determine a video board to buy that is compatible with my mother board (PCI-express) and has potential for dual-display under QNX632. I see that the Matrox G550 (AGP) supports dual display under QNX. Does anyone know if the PCI-express version of that board (Matrox Millennium G550 PCIe) is compatible with the devg-matroxg.so driver? The driver docs list support for “Millennium G550” but don’t specify which bus.

Alternatively, any thoughts on how to get dual display when I only have one PCIx16 and two PCIx1 slots available?

Thanks for any input!