I have similar chipset one of my P4 build, i usually like old (K5-K10) and new AMD more . I just want to say that W2K/WinXP driver for SMBUS works for Win9x manually, other part of the driver setup that i had, did not install. Device manager - all well. I did use SATA at that moment, but i think for Win9x route you should use IDE. I try again Win9x in this, out of the box WinXP 32/x64 SP2-SP3 works better.
Not So Hot Pentium4 RetroPC Underdog - Desktop Build
Little Odd ATiChipset/Intel-Nvidia Die Shrink EditionPC
Intel Pentium4 631 3GHz 2MB 800FSB (CedarMill-D0 65nm)
ECS RS400-A LGA775 Socket ATX (ATi Xpress 200 & SB400)
NANYA 2x1GB DDR2 PC6400@667MHz (Dual Channel 1.8V RAM)
MSI Nvidia Geforce 7600GT 256MB GDDR3 PCIE (G73-B1 80nm)
Audio Sound Blaster Live! X-Gamer PCI (CT4670 - non-5.1)
250GB SAMSUNG SATA 7200rpm HDD
CedarMill-D0 is 65nm 65W P4 and 7600GT we have also available B1 edition die shrink, that is 80nm version and it seems work well for older XP Games, at the moment it has WinXP SP2 and even H264 DXVA works with Media Player Classic - Home Cinema (PowerDVD 7) . It has PCI-Express and AGP Express (2xPCI) and DDR1 and DDR2 support. AGP Express is slower than real AGP, but in Win9x we do not need fast videocard, maybe in AGP EXpress would be good to use Voodoo3 3000 and downclock Intel P4 with speedstep to 2.4GHz in Win9x? I may change SB Live to Audigy 2 ZS
I had some slowdowns with Win9x SATA and i think to dual or triple boot Win9x/XP/7 with IDE HDD/SSD if Win9x starts to work better with IDE, i probably use only 32bit versions, as it has 2GB RAM support, not more. This P4 i may starting to like after all.
31 different MiniGL/OpenGL Win9x files for all Rage 3 cards: Re: ATi RagePro OpenGL files