So far, there is only the TGA PCI card, which only does 80x30 with a resolution of 640x480 at either 8 bits or 24 / 32 bits.
This lists all the graphic cards that are known to work:
DEC TGA PCI (DEC21030) - 640x480 & 8 bits or 24 / 32 bits versions
DEC TGA PCI (DEC21030)