These are the selling points that  sold me on Poser 12:

• New Optix support, Nvidia RTX and Turing graphics cards.
The updates to SuperFly include support for Optix hardware based raytracing. This can yield significant performance gains in render speed.

• New SuperFly Adaptive Sampling improves render speed.
Another part of the improved SuperFly implementation of Cycles is Adaptive Sampling. This feature automatically adjust the render sampling based on image noise. This allows the render to automatically focus on noisy areas that need more rendering samples.

• New Intel OIDN, is a AI based noise reductions system
This new addition to SuperFly uses machine learning to detect and remove noise from SuperFly renders. When combined with adaptive sampling you can realize significant increases in speed and render quality.

First off...  Optix rendering doesn't seem to work AT ALL... Second...  rendering with RTX 3060 graphics card takes a minimum of 20% LONGER than rendering with my Ryzen9 5950X CPU.  Lets just say I'm not a happy camper. I have poser 11 pro and I was happy with it for the most part it just wouldnt work with my RTX card for rendering, I opted to  pay full price for Poser 12 so I could continue to use Poser 11 without upgrading. $250 bucks thrown out the window.

Y'all have a great day.