Okay, after much Googling etc, I learned I had to turn on SCUDA globally with the Nvidia dashboard. There was an 'individual' listing for P7, but not for PPro 11. Note NO RegEdit or re-boot required. As both my GTX 750 Ti cards have 640 cores, I warily cranked Superfly up to using 'Bucket = 1200' of them. Designating more slowed rest of PC.

Can now rapidly (!!) progressively render ~2/3 of my wide scene in 1090x570 window. Using Poser lights rather than super-ambiance, which I'll try next.

But, there is very little scene size difference / complexity between 'renders progressive' or simply stalls out. No error message in Poser log, just a blank render...

So, other than wary iteration, pushing render limits until GO becomes NOGO, how do we judge what will or won't Superfly ??

Does PPro have a 'Task Gauge' somewhere that reports scene poly-count, materials / textures etc etc ?? Should it ??

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FWIW, currently running 34 pixel sample progressive render. Windows' Task Manager shows 80~~85 % GPU usage. I'm getting an acceptable UI & kbd lag...