http://www.matrox.com/mga/support/drivers/bios/home2.cfm
Also available (8/31/2005) is version 2.58 of the BIOS updates for the G200, G400, G450, and G550 video cards, and version 3.51 version (4/9/99) of the Unified BIOS updates, which puts the G100 AGP at 1.6, G100 PCI at 1.2, Millenium II PCI at 1.5, Millenium II AGP at 1.4, Mystique at 1.8, and Millenium at 3.0.
Source: OS/2 Warp News and Rumors