Kepler doesn't support Optix past version 4, and it only supports Cuda 3.

I think P13 is built on optix 6 and Cuda 9 or 10, with 5.0 compute as a minimum requirement.

I think that puts it at an rtx 2000 series as a minimum gpu for P13.... I have a GTX1070, and it wont render in P13. 

I presently have an RTX 2060 and a RTX 4070ti in my system, and both work in P13.  If you have multiple versions of Poser, older gpu's don't work in the new versions of Poser,  and new cards don't work in the older versions. With both of those cards I can render on P11 - 13 with the 2060, and I use the 4070ti in P13. The 4000 series cards wont gpu render in P11 and 12.

This is an issue with all programs that use Cuda/optix, or Hip/OpenCL that use AMD gpu's. The gpu's have to match the compute level the program was assembled for. Reverse compatibility is a big problem simple due to additional hardware sections added to newer versions of the gpus.

There is literally no way to build the render kernel for a Kepler gpu in Poser 13, the hardware isn't in there to compute it. Just as P11 can't use the hardware in an Rtx 4000 series because it didn't exist to program it into P11 at that time.

This probably isn't what you want to hear, but I hope it gives a better understanding of the requirements and issues gpus present in terms of programming issues due to the hardware requirements.

On the plus side, renders on a 4070ti in a desktop only take a few minutes. The difference in compute power of the newer high end cards is massive, compared to older ones. But the high end cards are also expensive.......... Might be time for a new desktop system.

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