PCI Express Gen4 - 3 slot passive backplane

Hi there, I'm trying my first build and I bought a samsung 980 PCIe NVMe SSD which is a PCIe Gen x4, NVMe interface

Card capacity and size · Slot 1: gen 4, up to x16 lanes · Slot 2: gen 4,up to x16 lanes · Slot 3: gen 4, up to x8 lanes

m2 vs nvme slot 1x SSD slot , 1x SSD Combo (NVMe PCIe Gen3 1x 2280 NVMe Gen 3 slot + 1x 2280 Gen 4 ; 1x 2280 NVMe Gen

m2 slot pc Hi, I currently am using a Pi 5 and I have connected via a Blue USB slot an External SSD enclosure, with an PCIe Gen 4 NVMe SSD in it