4GB for doing GPU rendering is crap. I know because I have two 4GB GTX cards. You'll run out of texture memory and one of three things will happen: The render will crash, the render will slow down to a crawl because of memory swopouts or Poser will crash. One clothed figure with a furnished room prop is enough to go over 4 Gig. When using multiple figures I Use the same textures for hair/inside the mouth/ eyes to save memory.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740