My GTX 1060 6GB is running @ Pcie x4 3.0, I tried everything (Reseating, Pcie Power cable adjustment) Nothing seems to work. I'm on a Ryzen 5 1600 @ 4.00Ghz, G.skill Ripjaws
My GTX 1060 GPU doesn't work on Blender 2.9 as OptiX - Blender Stack Exchange