Just a few things: - RAM still doesn't matter. It's virtual memory, so RAM+Swap file. And the standard Win32 limit is 2GB here, if those are full you cannot render. - dropping min shading rate below 0.2 is mostly useless as poser uses the maximum shading rate of the render and object settings. Objects usually have a shading rate of 0.2, so unless that is changed it doesn't matter - Poser's interface is only refreshed after a bucket is rendered, so higher bucket size = less responsive UI = more memory used, but faster renders