Question Best Amd motherboard and cpu set ,high end??

7800X3D, B650 with decent VRMs. B850 as well if reasonably priced. Some X670 boards might be similarly priced, always worth a look.

But it really depends on the motherboard features you want, and size for that matter. If it is just a basic build and you are only plugging in a GPU and an NVMe SSD or 2 90% of the boards on the market will work.