Okay, so I've tested this chip thoroughly and I guess I'll leave my findings here in case someone might want to tinker with this chip or drivers in the future:

While this chip really is a 3D-capable chip, the fact that it only has 2.5 MB VRAM limits it to the point that most games and programs will *NOT* recognise it as a 3D capable device, regardless of all the settings.
The chip itself supports DirectX 5.0 and OpenGL 1.0 but with some features missing so the GL games that I tried, such as GLQuake did not work.
3D games that require DirectX 5.0 and a minimum of 2MB VRAM detect it properly and play surprisingly smoothly. Here's the software and games that I tried:

• PC Player D3D Benchmark - 24 FPS average with Anti-aliasing on, at 512x384 resolution. Z-buffer and Fog had to be turned off as the chip does not support those features.
• Touring Car Championship (also known as ToCA) - 20 FPS average on very high settings with lowest resolution (320x240?). 25 fps with lowest settings. Fails to run at any other resolution except lowest.
• Croc: Legend of The Gobbos - 35 FPS average with texture smoothing and perspective correction, at 512x384 resolution.
• Monstertruck Madness 2 - 25 FPS average, mixed settings, at 640x480 resolution.
• Half-Life - 30 fps average, all lowest settings, at 512x384 resolution. The drivers hate this game. Picture turns completely white when the drivers give up, which is around a few seconds after getting into the game.
• Wipeout XL (Wipeout 2097) - 20-35 fps, 640x480.
• Urban Assault - 15 FPS average, the only game that managed to run at 1024x768. Oddly enough, choosing any other resolution than this or 512x384 causes graphical glitches. Framerate was exactly the same at 512x384 like it is on 1024x768. Yay for drivers.

These results may seem underwhelming, but the gaming was smooth, as the FPS didn't vary much from the average. Due to this, the feeling is similar to that of how the games play on PlayStation 1.

So what exactly is wrong with this chip? Bottom line
The Drivers.

When the drivers work, this chip outperforms S3 ViRGE GX in terms of performance and image quality. I'd say it's 50% faster compared to some youtube videos of the ViRGE. The fact that it has it's own VRAM instead of using shared RAM is probably the reason why it's able to play the games that I tested above without any hiccups.

When the drivers don't work it's a shitshow. Any time the resolution is set to anything higher OR lower than 512x384 (Monstertruck Madness 2 being the -only- exception), the framerate dips to single digit numbers, graphical glitches fill the screen, and if that's not enough, the drivers can crash *without* crashing. Yup. The game will still run, screen will slowly turn completely white and you can just barely see some polygons still being rendered somehow.
Half-Life ran for around 2 minutes before the screen turned completely white, yet it was still being rendered at roughly 30 fps. Croc and ToCA had 2D transparency issues but otherwise fully playable.

Verdict: What could have been a decent low-end 3D graphics chip was completely ruined by it's drivers. It will play DirectX 5.0 games that require less than 4MB VRAM on low-to-medium settings but nothing else. Also, requires getting used to 2D-over-3D transparency glitch because that's how it is. When it works, It's overall performance is on-par with software rendering on a 300 Mhz cpu.

System tested:
Toshiba Satellite 4080XCDT
OS: Windows 98SE
CPU: Pentium II MMX @ 367 Mhz
RAM: 128 MB DDR @ 66 Mhz
HDD: Toshiba 4200 RPM, 30 GB

Tested with these drivers https://content.us.dynabook.com/content/suppo … ds/s259vid8.exe
Another driver from a different toshiba laptop caused instability and ran slower than the one above.

Update: This chip behaves nearly identically to the Trident 3DImage 9750. All the games that are compatible with this card appear to work on the Cyber9525DVD also, with the same performance figures and graphical glitches.

A list of 3D Games that I tested which are playable on this chip (min 20fps, sorted by best image quality/framerate)
- Croc: Legend of the Gobbos
- Wipeout XL (Wipeout 2097 in Europe)
- Monstertruck Madness 2
- Urban Assault
- Tomb Raider 2
- Touring Car Championship
- Sega Rally with D3D Patch