The top B650M board for a 7800X3D is the B650M-A with PCIe 4.0 support.
The top B650M board for a 7800X3D is the B650M-A with PCIe 4.0 support.
Technically, the top mATX AM5 board is the Crosshair X670E Gene, but it's quite costly for most users. More affordable choices include the B650M-HDV/M.2, B650M-A Pro, B650M Aorus Elite AX, and B650M Mortar. Each has its advantages and disadvantages, though all perform well with an X3D. Review the specifications and cost, choose what suits you best, and you'll find no issue with any of them.
The Gigabyte memory VRM is reportedly prone to some buzzing, but this depends on individual experiences. I own the ATX model without any coil noise, so it won’t be completely free of whine.