Did you try to disable PnP in the bios?
EDIT: Oops, I missed the line where you clearly said you can't.

James-F wrote:

Did you try to disable PnP in the bios?

I don't see an option to disable it. I've attached an image of the PCI AND PNP SETUP menu options.

Considering how even at POST the MHZ is incorrect, maybe PnP is a red herring and the actual problem is somewhere else. Could it be a power supply issue? Not enough power?

wallaby wrote:

. Could it be a power supply issue? Not enough power?

Hardly

Try forcing the IRQs and DMAs in the bios.

Well, I have them both working independently now.

But the computer still POSTS 8 mhz, 64 mhz, 240 mhz, randomly. I think it must be a bug with how the bios displays the mhz value because the computer seems to run fine regardless of whatever it displays. I'll run a few benchmarks to be sure.

Also, the DIAGNOSE step in start up for the Sound Blaster complains about environment not free or something, but it doesn't seem to matter. The card still works. So I've just removed that from the autoexec.bat.

try disabling the ps/2 mouse, it might get crazy about not sharing irq12. I have a computer with guspnp and awe32 that I had to disable mouse in bios because it use irq12 and I cannot get the hell of those two cards to play along if that irq is not free on the machine.

I also experienced some weird behaviour in my ASUS PVI-486SP3 motherboard when I plugged in my Compaq Ultra-Sound 32.
At first it worked fine and then one day, no more sound output. When I plugged the card into another motherboard, sound output was fine.
I haven't had the time to explore this problem further.

However, coming back to your issue, you might want to check if you can flash your BIOS to a later version, but this is dependent on your motherboard revision and what type of BIOS chip your have (the 5V or 12V type).
There are some other threads about the PVI-486SP3 motherboard and the different BIOS revisions.

You can perhaps just try to load your BIOS Setup Defaults and then see what happens. Also try and reseat your cards and memory on your motherboard.

Of course you did try the guspnp eeprom tool to disable redundant stuff on the guspnp like the sb emulation irq or useless stuff like that ?