Good discussion.
I've been looking into a replacement for my Pentium pro system, at the time when I bought my 6200 pci I thought I'd go for the latest pci card that supported windows 98, big mistake!
ALL PCI 6200s are 64 bit cards, interestingly enough, most FX5200s aren't gimped with a 64 bit bus!
The standard clocks for the PCI FX series are roughly this.
CPU Memory
FX5200 250 400
FX5500 275 400
Quadro 275 490
Inno3d 325 500
IF I can ever find a pci Inno3d FX5600 256meg they'll have to pry it from my cold dead hands, Its clocked at 325 CPU & 500 Memory, IMO that's the best era card for a Pentium 3 system running windows 98SE, unfortunately it appears this card was rare even 10 years ago so it might be next to impossible to source.
http://web.archive.org/web/20061020054640/htt … /gf_fx/5600.htm
How about the Quadro? It works exactly the same as the cards no funny driver issues just use the detonators?
EDIT: I forgot about the ATI 9100! Its the same as a Radeon 8500LE with 64meg of memory 250 CPU & 500 Memory, it has 8 texture units compared to 4 in the FX series, that should be the fastest era card for windows 98 but the Nvidia might be a better combo card for dos/windows, don't know.
Unfortunately that's another rare card.