You need VIA AGP driver that works well on your motherborad and videocard at Win9x. What videocards you have or you need to buy it first? I would start from VIA AGP 405B up to VIA4in1 4.23 if needed.

Voodoo based cards and earlier GeForce cards

The ideal agp card for Socket 7 is one that behaves more like pci66 than agp, too many obscure agp features and more likelyhood of nonsense.

I've tested a good amount of different AGP cards on my VIA super socket 7 board and mostly work OK.

What I actually keep installed is a simple Geforce FX 5200, mainly because it has a DVI output.

If you want something simple, cheap that just works and covers most needs in DOS and Win98 I would go with a Geforce 2 MX.

Just watch your VRM temps. A lot of super socket 7 boards cannot handle cards that pull a lot of amps on 3.3v without cooking to death.

Voodoo 3 is generally too much for a lot of these boards.

IDK about this board specifically but you'll have to check, you may find it uses 3.3V direct when you use the ATX power socket, unloading the regulators. If it doesn't it may be somewhat straightforward to strap it in yourself.

Another option especially if you have a PCI Voodoo2 to go along with it, is to use an early AGP 3D "decelerator" from before the ATI/Nvidia dichotomy took hold since it's really the compatibility you're after. I have a Cirrus 5465 in my MVP3 system for example. A comparable S3 should work fine as well, though some of those have a video BIOS that defaults to brightening black backgrounds.