3dfx Voodoo1-Cards are working up to 366/400 Mhz (depends on the machine) above that you will likely get in trouble with D3D on Voodoo1. Glide seems to be fine.
I always use 512x384 or 640x400 if possible on voodoo1 because it's MUCH! faster than 640x480! I reccomend 512x384 though on EIZO L367 because no vertical lines with that resolution on L367 TFT. Beside that, I always use Pentium 1/2 even for a voodoo1. AMD Kx do perform bad on floating-point and therefore bad in 3D. There are some patches that fix that. (3Dnow drivers etc.).

I am pretty sure that your voodoo1 card does not use hardware-acc, 1-2fps sounds like software mode.

Make sure you have the right drivers for the diamond monster maybe test other 3dfx/glide games, also make sure quake is updated to latest version I've had older versions installed from disc have issues as the build is quite old. I don't think Quake plays the 3dfx splash screen when launching but it's been a while so i could be wrong there. It's also worthwhile checking the pins on the 3dfx chips to see if there's any bridged / shorting this can cause weird problems.

Thanks both. The card is physically in great condition:

I'm running GLQuake 0.97 / WinQuake 1.09 / Quake 1.08. The same release I have on my Voodoo II SLI machine.

I'll have to install some other Glide games to test. FWIW, hardware accel is ticked in the driver and the 3DFX logo on the display panel is spinning away nicely.

Perhaps you have a voodoo2-glide drivers (or third-party-ones) in your copy of quake.
I think you should install the minigl-drivers for the voodoo1 in the quake directory.

Hmm. I've installed the 1.47 MiniGL and that appears to have made Glide games render a solid yellow screen and a system hang. Tried GLquake and Quake II, both yellow-screen and hang when either launching GLQuake or switching to 3DFX OpenGL in Quake 2. 🙁

Not looking good.

paradigital wrote on 2020-07-13, 08:17:

Hmm. I've installed the 1.47 MiniGL and that appears to have made Glide games render a solid yellow screen and a system hang. Tried GLquake and Quake II, both yellow-screen and hang when either launching GLQuake or switching to 3DFX OpenGL in Quake 2. 🙁

Not looking good.

Try the 1.46 minigl driver, The card may be faulty do you have another system you can try the card in, maybe with a fresh windows install?

I guess I could rip apart the Slot-1 P3 machine and install a fresh copy of 98SE on it.

I'm currently trying the existing Asus SP97-V machine, but without the S3 ViRGE/DX and instead using the on-board SIS 5598 VGA that was previously disabled in the BIOS.

Ok, progress. The SIS 5598 and Voodoo 1 combination appears to work. I'm stuck at resolutions and/or refresh rates that my LCD wasn't happy with so had to drag out an old Olivetti 14" CRT to test with, but both GLQuake and Quake 2 now run, not particularly smoothly, even at the lower resolutions, but I think now this is a combination of a mix of installed drivers and the minigl versions in play. The card however doesn't artifact or crash, so on that front we're golden 😀

I'll try a couple of other VGA cards I have lying around.

L367 and you are good to go, do you need the variables for autoexec.bat?

Anything you can give me for performance tweaks is appreciated 😀

Thank you dr.zeissler

you're welcome 😀

If you have a diamond with fast ram than you can use this autoexec.bat:
-------------------------
@SET SST_FASTPCIRD=1
@SET SST_FASTMEM=1
@SET SST_SCREENREFRESH=75
@SET SST_RGAMMA=1.25
@SET SST_GGAMMA=1.25
@SET SST_BGAMMA=1.25
@SET BUILD_512X384=1
@SET BUILD_GAMMA=1.25
-------------------------

I always put heatsinks on the 3dfx-chips!
Beside that I do not recommend changing the clock-speed!

I recommend 75hz because than you will likely have a centered screen on TFT using 3dfx and onboard-vid on same resolution.
using 60hz I don't get 640x480 exactly the same between onboard/3dfx.

dr.zeissler wrote on 2020-07-13, 16:45:

you're welcome :) […]
Show full quote

you're welcome 😀

If you have a diamond with fast ram than you can use this autoexec.bat:
-------------------------
@SET SST_FASTPCIRD=1
@SET SST_FASTMEM=1
@SET SST_SCREENREFRESH=75
@SET SST_RGAMMA=1.25
@SET SST_GGAMMA=1.25
@SET SST_BGAMMA=1.25
@SET BUILD_512X384=1
@SET BUILD_GAMMA=1.25
-------------------------

I always put heatsinks on the 3dfx-chips!
Beside that I do not recommend changing the clock-speed!

I recommend 75hz because than you will likely have a centered screen on TFT using 3dfx and onboard-vid on same resolution.
using 60hz I don't get 640x480 exactly the same between onboard/3dfx.

I do have a Diamond, but what NS would be “fast” for a V1?

Both main 3dfx chips had heatsinks applied before I installed the card 😀

I’ll try the recommended settings and report back!

Sorry missleading...these settings do work with every diamond. the ones with a faster ram could perhaps be clocked higher than 50mhz.
don't forget that FASTPCI und FASTMEM already tweaking the speed. Clocking the card higher does not result in much more frames, so
I recomend these settings above.