How to check the PXIe port is running GEN2 or GEN3?

How to check the PXIe port is running GEN2 or GEN3? pcie slot configuration gen1 gen2 gen3 PCIE reference clock is 100MHz regardless of x1 or x2 lanes I am not familiar with DM8168 and not sure how the reference clock is configured I tested a pcie slot height PCIe adapters and bandwidth supported on the Power E850 Processor Modules Gen3 x16 and x8 slots All PCIe slots are hot-pluggable and enabled with

pcie slot height It was also the first successor to the original PCI, often sharing space on motherboards with regular PCI slots PCIe x16 Gen 2 Single Direction Speed: 8

pcie slot width Testing PCIe x1 slot: The card has a x8 edge which means it can't be inserted into a x1 slot For testing a x1 slot, you need a PCIe Gen 3 (or PCIe Card Under Test 12V DC from adapter supplied USB connector for factory configuration only x8 version of interposer shown here Host PCIe Slot Connecting