I thought I'd post some notes. My highest score was achieved with a fresh install of 98SE and Direct X 7. A single 128 had the same scores as a pair did, but adding another128 stick dropped the score several hundred points.
Though it mostly worked fine with the default chipset drivers, these MVP3 boards seem to have IRQ issues when using a Promise controller card (I use an Ultra 100 TX 2 with a SATA adapter and an SSD). The computer will be running fine, then lock up while running a benchmark, then refuse to boot when you hit reset. Power it off and move the Promise card to another slot, and all is well again. Even though I have the primary IDE channel disabled, it still likes to share the IRQ with the remaining one. The only cure I've found for this is to install the Via 4.17 chipset drivers; once those are installed I can stop moving the Promise card around. But installing them does slightly lessen the 3D Mark score.
Win98 isn't the most robust operating system, and it's easily damaged by attempts to push your hardware. Tiring of reinstalls, I decided to find a way to image the drive. Clonezilla has worked well for me on modern hardware, but I had no luck with my antique Socket 7 machine. It turns out that Norton Ghost 2003 is available on Internet Archive, and it works very well with this system. It only takes a few minutes to make an image that it saves to a secondary partition of your hard drive. You'll also need to install Instmsi.exe to install Norton.
This Epox MVP3G-M is the only MVP3 board I've had that has worked with every AGP card I've tried, including an FX5500, FX5600, and a GeForce 4 Ti4600, and it has no issues with running AGP 2X. None of that really matters much for the point of this thread, since the champion card is a GeForce 3 with 7.76 drivers, and the difference between AGP 1x and 2x is negligible.
"A computer once beat me at chess, but it was no match for me at kickboxing." - Emo Philips