September 2023 update:
RAM is upgraded to a single 32MB FPM module (Texas Instruments TMS417400ADJ-60)
Bus frequency increased to 40MHz, the CPU runs as DX4-120 now. With two VLB cards I am not seeing any instability.
With the new specs Duke Nukem 3D should be playable but I ran into a stuttering problem discussed in 2016 when using DreamBlaster S2 regardless of audio quality, screen size or detail settings.
This post by user orcish75 suggested Duke3D is faster in Windows 95 than in DOS and yes that fixed it. The game runs well in 320x200 with SB16 sound and DreamBlaster MIDI with reported FPS of 20-30.
So the system runs Windows 95 OSR1 now (the one without Internet Explorer, USB, etc.) and I also tested some Windows games:
- Breakthru! (Spectrum HoloByte, 1994)
- Lode Runner: The Legend Returns (Sierra, 1994)
- 3-D Ultra Pinball (Sierra, 1995)
Aladdin95 (East Point Software, 1995)
aladdin 95 epi.jpg
All running well.
Trident 9440AGi even has a Windows95 driver that claims some acceleration.
NSSI for the new config
nssi win95.jpg
CACHECHK v7 by Ray Van Tassle: 123.3 MB/s, 51.5 MB/s, 29.8MB/s
cachechk 32mb dx4-120.jpg
Doom fullscreen (from DOSBENCH pack) is 1710 realtics = 43.6FPS.