PCIe passthrough issue with PCH connected device

What are the differences between 2 x PCIe x16 SafeSlots , 3 x PCIe x1 slots , and 1 x PCIe x16 slot and what exactly

2 CPU, also known as the socket or slot for the processor, is responsible for the execution of instructions and the overall performance of the computer On the

pch slot slots have the data bandwidth available from trace paths direct from the CPU and the fourth slot taking PCIe lanes from the Intel® Z97 PCH GIGABYTE 9

usa slot The motherboard is MSI B550M Mortar Wifi and the bottom PCI-E slot is connected through the PCH After booting, the amdgpu kernel module