I can't speak to as much of the hardware questions. But for 3b: In my real world production experience OpenCL, for the most part, was faster, in Pyro, by a factor of 5 when properly configured.
Hey all! I'm having an issue where my flip sim is there one frame and then the particles are gone the next frame... I can't seem to find a cause. Hoping you all can. I'll post the hip shortly.