Although Poser can and is used by some professionals it is regarded as hobbist program and as such does not need a graphics workstaion to work.  Support for OpenGL is useful    it can improve the scene preview by showing better representation of textures and shadows.  

I have been using Poser for the best part of ten years and have never prurchased anything more than an 'average' game card as for as graphics is concerned as it is only used for preview, all the rendering is done by the processor.  The only exception to this is some of the new render engine that use the GPU for renders. 

The advice I recieved when I started was that you need not pay the earth for the graphics card and any money saved was better spent on buying a processor with as many cores as possible and as much memory as youe system or operating system could support.  I think the only change ten years on would, in addition, be to make sure you are running a 64bit Operating system.

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.