DS720+ NVME M2 slot x1 or x2 or x4 ?

I found a setting in the BIOS to switch the active PCI-E slot from 2 to 3, evidently, you can only use one at a time It was set to 2 so I

2 slot are between the GPU and CPU, or in the lower right part of your motherboard Some motherboards even have a special metal plate that

what are slot games 2 slot are between the GPU and CPU, or in the lower right part of your motherboard Some motherboards even have a special metal plate that

what is imei slot 1 and slot 2 NVMe is a communication protocol designed specifically to work with flash memory using the PCIe interface NVMe