Like you I've got a working SLI setup in BX based SMP system (In my case a Asus P2B-DS) so we know multiple CPU's shouldn't be an issue, Perhaps chipset?
I don't think it will but does just a single voodoo card work?
What about if you drop back to just 1 CPU?
I wouldn't think MP or ACPI matters but during setup when it says "Setup is inspecting your computer's hardware" you can hit F5 and select a different hardware profile and try mps system

I have SLI working on a 440FX board using the MPS HAL in windows XP, so MPS isn't the issue

but MPS + Win 2K vs. MPS + Win XP, is there a difference? which drivers are you using, do you have 2 CPUs on your board?

BoYan wrote on 2023-03-28, 14:02:

but MPS + Win 2K vs. MPS + Win XP, is there a difference? which drivers are you using, do you have 2 CPUs on your board?

Yes 2x Pentium Pros clocked at 233. Using the fast voodoo drivers

I had no issues running 2 V2s in SLI with Dual Xeon 550/2M but I don’t own the system anymore to watch for further detail.
It just worked great.

Does it work with 1 Card ? Or maybe one CPU only ?

I also would check with win98 if it works here.

OK; update (all tests are done under Win 2K, DX9.0b, drivers 3dfx v1.02 / Gold drivers v4.0)
1 CPU - 1 card -> works OK (tried with both cards separately, to check for possibility of faulty card)
1 CPU - 2 cards -> SLI works, but freezes after a few seconds, seems that they become de-synchronized (I see horizontal misalignment)
2 CPUs - 2 cards -> no-go, still black screen.

I've seen another symptom on this motherboard which seems interesting - Supermicro p6DGS is AGP 2x capable, but seems that it don't have very strong power delivery to AGP slot - anything stronger that a geforce 2 (tried gf3ti, gf4ti, even Radeon 900o) - it shows corruption in screen or just blacks out before it reaches windows.

Worked OK with Ati Rage 128 Pro, RIva TNT2 m64 and GF2mx400.

If I have time today, I will try to install Win2k yet another time, just this time, will try to hit "F5" during installation and choone Multiprocessor ACPI instead of MPS, to see it if will work...

EDIT: I've noticed that the MB has auxiliary power supply connector on the upper right corner - do you think it's needed for the proper functioning of the board? the previous owner told me he used the board without it (without any problems), and so far I'd say that also in my case it is working fine (except for the AGP stronger cards issue).

At least its worth to try it, it provides additional 2 3,3V Power Lines and one 5V Power Line.

The Voodoo 2 should only use 5V from Slot as far as i know.
It has own Voltage Regulator onboard.

What PSU do you use ?
If its a modern PSU it likley has not enough Amps on 5V.

I found out my PSU has additional 6-pin connector and connected it, and voila - all started working as it should. Me very happy 😊

My PSU is relatively old but solid, an LC-Power 550W atx 2.0 model, with ~200W on 3.3V and 5V combined, so I should be fine...