Oh, i totally missed your update on the stability issues. Do you think it is related to the matrox drivers, or maybe the agp implementation of the board/chipset? Never tried that combination myself. Especially not under Windows 2000.
As for the V3 3500... you could still try to find a reasonably priced Matrix M3D to hold on to the 3dfx&Matrox Combination... If a reasonably priced M3D will ever show up again, that is.
But please change the case fans I think I once had golden fans made by Enermax, if I remember correctly. Or at least they had a golden grill.