Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.38
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: rB3e85bb34d0d7
Worked: (newest version of Blender that worked as expected)
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Here is a copy of the Blender Branch with e-cycles.
This branch has lots of improvements for specific graphics cards.
With this, you guys can see what was made to improve cycles and improve it if this can be useful.