While maybe too much slow for 1997/98, the 3Dimage9750 seems enough "accurated" in old rendering which probably costs a lot in speed but still good. The driver probably make also the difference. 2D quality is indeed a bit better while 3D where it works, render quite well. Newer test like 3DMark99/2000 doesn't seem to run ok unfortunately. I'll try the usual games and benchmarks. Final Reality seems good and accurated for its time, maybe a bit slow. Quake based games seems having problems rendering, Thief Demo only works with Z-Buffer disabled @ 400x300 not bad. EDIT: Powerstrip report a memory clock (and only that) of 83 Mhz (overclock to 91Mhz seems ok). It doesn't seem to read AGP speed anyway, I try to reinstall the Intel INF drivers.
I've found a different driver (middle 1999) beside the last one on the Trident website. I'm going to test it to see if something improved. EDIT: The 1999 driver found is a bit slower than the last one (which seems having a date older than this one which may be some beta or whatever) and lack the Texture trilinear mipmapping in Final Reality check list when the last one has that! Final Realiy for that decrease the image quality score. Also the audio card seems having problem with this graphic driver.
EDIT! Interesting, a beta 9750/9850 driver can actually render 3DMark99 MAX in-game texturing and also have Bump Mapping test 1 enabled which before could not with final driver! While it's slow for such heavy bench, Final Reality scores is almost the same only a bit slower than the previous driver I tried. 3DMark99 score is 173 3DMarks.