looks like a Matrox Millenium II card to me

2MB version that is for sure.

2064 = Millennium
2164 = Millennium II

Yes, it is the first generation Millenium card.

Compare it with the 2nd Generation here:

http://www.amoretro.de/2011/12/matrox-millenium-ii.html

You will notice that the 2nd generation chip has a ball grid array.

Thanks, so it's a Matrox Millenium I 2MB.

What were those two long thin headers north and south of the memory modules for? 😕

You plug the RAM upgrade module there:
http://www.amoretro.de/2011/11/matrox-milleni … odul-2-2mb.html

I see, thanks. Interesting relic then, a video card you can plug extra RAM on 😦 .

That was nothing unusual back in these days. ATi did this with their Rage cards on a PCB module as well and before that, other manufacturers used DIP/DIL modules to upgrade the RAM.
But even some soundcards or controller cards could be upgraded with (common) Simm, PS/2 or Dimm RAM.