Small test for this combo
Ignore the other GPUs there, as can you see they're at 0%, I have more than 1 for Machine Learning.
Specs:
AMD Ryzen 7 5800X
32GB DDR4 3266Mhz RAM
NVIDIA RTX 3080 TUF at PCI-E X8 4.0, Shunt modded, used for this video
NVIDIA RTX 3070 Ventus 2X at PCI-E X4 4.0
NVIDIA RTX 2080Ti Zotac AMP! at PCI-E X4 3.0
Windows 10