NVIDIA GeForce RTX 30 Series OpenCL / CUDA / OptiX Compute + Rendering Benchmarks - Phoronix

That's the quick look at the current RTX 30 line-up compared to the RTX 20 series in a wide variety of GPU compute/rendering workloads.

RX 6800 XT is 12% faster than RTX 3080 on Linux (source in comments) : r/Amd

GeForce RTX SUPER Linux Compute Performance - 18 GPU NVIDIA OpenCL Comparison - Phoronix

Blender 2.90: Best CPUs & GPUs For Rendering & Viewport – Techgage

CUDA - Wikipedia

OpenCL - Wikipedia

Blender 2.81 Benchmarks On 19 NVIDIA Graphics Cards - RTX OptiX Rendering Performance Is Incredible - Phoronix

CUDA vs OptiX Render in Blender Cycles

NVIDIA GeForce RTX 30 Series OpenCL / CUDA / OptiX Compute + Rendering Benchmarks - Phoronix

NVIDIA RTX 30 Series vs. AMD Radeon Linux Gaming Performance For April 2021 - Phoronix