I believe i had that card. Not sure if it was the M1 version someone mentioned or yours exactly.
The 8mb rage card that i had wasn't DX8.1. No T+L engine, no pixel engine. The game would run, although i would get two bugs.
I would get the loading bug (where when a mission would launch and stick on the loading screen, requiring an alt-f4)
and, when it did launch the ship models wouldn't be drawn. It was like flying four shields through space, with no ship. When i would get hull damage plasma would leak from open space. It made all empires play like Borg becuase you couldn't tell which direction was forward. LOL.
It was a pretty wacky 'bug'.
On the plus side it was kool when i upgraded to a Gf3 Ti200 128MB card. The ships looked pretty sweet then. O yeah, i haven't had the Loading bug at all since the upgrade. I have Dx9 installed.