Not true,
There was a MP version of the 9500 in the 1990's!
Umax made a MP 3rd party model too! (I wrote a driver they sold with each Umax))
Apple has had various official MP (multiprocessor) libraries for years for people writing vertical market solutions to PROPERLY share multiple cpus on a mac. Even mass market software uses MP under os 9 :
Premiere, DeBabelizer, iMovie2 and SoundJam MP Plus 2.5.1, Adobe Photoshop 6.0.1(Gaussian Blur, Unsharp, Resize, Rotate Canvas, Render Lighting effects, etc etc)
Parts of QuickTime are MP-aware
"Impossible" is a powerful and absolute word. Luckily it has a concrete meaning. In this case the it is shown that IT IS NOT IMPOSSIBLE.
Unless you are referring to my brand of card somehow being defective under OS 9's MP library from apple. I did not remove Apple's MP plugins and assume it is working fine.