How to determine from command line if NVMe slot is gen 3 or gen 4?

Historically, updates to PCIe doubled transfer rates and used multiples of 8 since generation With PCIe , bandwidth capacity is 64

PCIe PCIe x 16 Slots 7 · 6 · 5 · 4 · 3 · 2 · 1 SSD Slots 5 x EZ-Latch：PCIe Slot with Quick Release Design; Fast Networks：GbE LAN

pcie 4 card in pcie 3 slot Hence, PCIe x4 The signaling is different between the two You cannot make a PCIe device turn into So if that card was a PCIe

pciex16 slot 3 Slot x16 Gen4 PCI Express Backplane Dolphin's IBP-G4X16-3 three slot backplane enables customers to establish a remote access to two PCIe devices