An NVIDIA GPU with CUDA support (Compute Capability 3.0+) is required for Windows. Recent updates recommend at least an RTX 3050 or higher for optimal performance.
If you want to use OctaneRender for Cinema 4D R20 without an initial purchase, here are the legitimate options: Octane Render For Cinema 4d R20 Free Download
Octane Render is a GPU-accelerated rendering engine that harnesses the power of your computer's graphics card to render complex scenes and animations. Developed by OTOY, Octane Render is known for its exceptional performance, scalability, and ease of use. It supports a wide range of features, including volumetric rendering, motion blur, and depth of field, making it an ideal choice for creating realistic and detailed visuals. An NVIDIA GPU with CUDA support (Compute Capability 3