If that's the isdcorp enhanced driver, then it's the best there is - there was some tweaking info
http://www.geocities.com/liaor2/myutil/5462oc.html
- the isdcorp drivers may be using those settings already.
This is a card that dates back to DirectX5 - so it lacks many of the essentials for acceleration.
The ISDcorp driver gave a considerable frame rate improvement on some things (eg. Serenescree aquarium screensaver), but resulted in diagnostic errors on others that WOULD run with the standard drivers.