Hi Macdrone!
The card (if installed) "shows" up as second monitor. With a resolution of 1024x768. My VGA Adapter (hooked to internal onboard video) is set to multiple scan 14", i.e. 640x480 and 832x624. Both variants (VGA Adapter on Video Card at boot time and hotplugged after booting) don't give me a signal. I know the VGA Adapter got dip switches letting the Mac know, what video mode to set at boottime.
So the card might work.
I'm running MacOS 7.5.3.
What exception could there be?
Regards