I agree, I doubt that card (awesome as it is), will make any difference to the Poser Previewer Window.  That feature was something I was looking forward to but in the end I just removed it.  Would be cool if it made use of the main window and used the GPU to compute.

That card is surely a real beauty for use with Blender Cycles or Octane, but like the others said, I can't see it effecting that previewer.  I think the previewer needs the most CPU cores you can get (assuming it's multicore aware) and as high CPU clock speed as you can get.

I know how you feel though, and it's a shame Poser rendering doesn't use the GPU to speed things up, I love FireFly and it would be incredibly cool if they could make it use the GPU to do it's number crunching.  I don't mean to make it a physical renderer, I just mean to speed the current one up.

Imagine seeing hundreds of squares rendering at once instead of the usual four, six, or eight!