Matrox cards were players in the early 3D gaming craze and a little into the middle 3d game range. The original Matrox Millenium had some simple 3D going on if the game was coded for it (like a racing game that came with the card). The Mystique line did ok with 3D games like the bundled Mechwarrior but you needed patches for games and the Voodoo series pretty much killed that line. Later you had the G series G100/200/400 ending with the G400 max that did bump mapping very nicely for DirectX7 era games. After that they pretty much gave up like everyone else except for ATI and Nvidia.

Few people are aware that Matrox had a professional capture line for a very long time. I have some EISA/ISA cards (like 4 or 5 sandwiched together) that were kick-ass back in the day.