From what I can read the CPU 5800H only has PCI express 3.0 and 16 lanes.
So that will properly leave 8 lanes for the GPU.
As before, the chips have 16 lanes of PCIe 3.0 connectivity, meaning Cezanne will not have PCIe 4.0 support. AMD allocates eight lanes to the graphics, while the remaining eight lanes are split between two NVMe interfaces for storage.
It is the same.
Just bought this laptop also, and have huge problems with the WIFI, it runs really slow and when running games it will report as slow internet connection.