I’m confused - all your data sources are marked as not visible in the image of the Pipeline Browser when using the GPU. You shouldn’t see anything in the render view. Make those visible and you will see objects rendered. If that is not the case, please include a screenshot of the entire application window.
I have a Quadro M4000 (NVIDIA driver version 431.70) on which I test all Windows release candidates. I haven’t seen this problem with any of the four Windows binary packages of 5.8.0-RC2.