Tested: Cycles GPU Rendering with PCIe x1 Risers (and RTX Optix support) - Technical Support - Blender Artists Community
Accelerating Cycles using NVIDIA RTX — Developer Blog
NVIDIA OptiX™ Ray Tracing Engine | NVIDIA Developer
CG Geek - Wait what?! The TITAN RTX is crazy fast! And with the new Blender 2.81 OptiX build with RTX support in Blender Cycles it renders nearly twice as fast on