Makavre wrote on 2023-03-09, 13:02:
if is the "ALiveDual-eSATA2" from asrock, it will most likely work under win98 but it will be a bit tricky to get it running because it contains both an ULI M1695 and Nvidia 3 chipsets.
About running simultaneous displays, I believe it is supported (surroundView) but from experience I could only get it to work when a PCIe & PCI card were installed.
IIRC AGP really hates any other GPUs being active in the system, SLI is one of the huge reasons AGP died as the bus could not support dual GPUs without hardware hacks, even dual GPU die cards like the Voodoo5 and Fury MAXX are treated like two separate GPUs by the AGP bus and by 98 itself and have to share the bus in rather complicated methods. Pretty sure 98 would have a fit if both a PCIe and AGP gpu were present and active, the OS simply wasn't designed to handle such a hardware configuration. XP/2000 may have a better time with it honestly as its built to handle multi GPUs.
IIRC ASROCK actually had a prototype dual AGP 8x board, I'm almost positive they had it at a tech show and showed off that AGP could be made to handle it. I suspect it was a hardware kludge though using multiple AGP chipsets and having each AGP chipset talk to the other via an internal bus.
None of this should be taken as me saying to not try it but rather to remember that 98 and AGP were both designed with a single GPU in mind and will likely have issues with a PCIe GPU also being present.
Edit - The Voodoo5 5500 has some 3DFX black magic going on with how it handles its multi GPU cores, its been a while but I'm pretty sure 98 actually only sees the V5 as one card, the Fury MAXX is seen as two separate cards by 98.