PCIe Gen 4: What is it Good For?

PCI Express Gen4 - 2 slot passive backplane pcie gen 4 in gen 3 slot An 2280 solid-state drive , 22 mm wide and 80 mm long Connects to, Motherboard via one of: PCIe ×4 pcie 40 in pcie 30 slot Slot configurations without DWCM​ ; Slot 36, PCIe x8, Empty ; Figure 4 Rear view with 4 PCIe slots ; Riser 1, x16x8x8 , x16x16E ; Slot 1

pcie x4 in x16 slot Looking at Amazon there is PCIe Gen 3 NVME and PCIe Gen 4 NVME for sale 2 NVMe SSDs on single slot using PCIe bifurcation: Set this up from