The bottom slot is a ISA slot, forget about it for video.
The 3dfx is a Voodoo 1 from 1996 which can have 4, 6 or 8MB VRAM.
It depends what Matrox Mystique you have. The original mystique comes with 2-8MB VRAM. It is also from 1996. The Mystique 220 is a 1997 release.
The Voodoo 1 is the slowest, then the Mystique and the Mystique 220 is the fastest; but if they don't have 8MB VRAM, then they're rather sub-par. Frankly they were all mediocre.
If memory serves, the fastest PCI VGA ever made was the from 2004
(NOT the PCI
e version and NOT any AGP version for your system
). There are plenty of 256MB versions on eBay. It even has a Windows 95 driver although there won't be DirectX 9 support on Windows 95
The other two cards are DirectX 3/5 cards.
As for the sound card. The CT4170 is a 1997 Sound Blaster 16 WavEffects. The last generation ISA release and a budget model. This has line in, speakers and mic + midi/joystick.
The CT3670 is a 1995 Sound Blaster 32, also a budget model but yours has the SIMM slot so it is comparable to an AWE64. This has line in and out, speakers and mic + midi/joystick.
I *think* the CT4170 supports 44KHz sampling, so might be the better card. I have no idea what driver support is like for either, but I might imagine the 1997 card has a better chance of supporting Windows 2000 and XP than a 1995 card.
