V-Ray and Blender are rendering benchmarks that are used by leading tech sites for hardware reviews. They can test variously both the CPU and the GPU. The CPU gets fully loaded with both these (like CineBench)
Both are free.

Blender 3.5 - blender.org - Home of the Blender project - Free and Open 3D Creation Software
Benchmark - Blender - Open Data

VRay and Blender rendering benchmarks-blender-benchmark.png

Homepage - V-Ray Benchmark – test your CPU/GPU rendering power | Chaos
Has three benchmarks available (see below). Registration is required if you want to register your scores in the developers online results.

VRay and Blender rendering benchmarks-vray.png