Mactron sent me one of these cards, but it appears to be partially dead, so Diehard sent another, and I put it in my Quicksilver, with out flashing it, and loaded the ROM for the Gainwood Dual DVI card onto it.
The Mac booted OS 9, and the card is fully supported. I tested 2D/3D and DVD Playback, what is more is, the OpenGL driver reports as Quadro4/AGP, rather that Geforce4Ti.
I never knew that OS 9 had the unified driver Unified Driver Architecture for OS 9, like OS X does, however it appears to work great. OS X requires a hack to add the Device ID to the NV20HAL for this card to work, even tho there is driver support for the card.
I'll have to run some benchmarks and see which card is the king of OS 9, Gainwood Dual DVI 4600Ti, or Quadro 900 XGL.
Stay turned.
As always, thanks to Mactron and Diehard for providing test cards, Arti Itra for our Geforce4Ti ROM maker, Joe van Tunen, Segher Boessenkool, Tarl Neustaedter , and Mark Cave-Ayland for being our general Open Firmware Guru's, and putting up with my, sometimes, dumb questions.