How to manually change pcie speed?

Gen 1 is older PCIe Gen 2 is PCIe and Gen 3 is the new I have my 570 cards in Slots 2 & 4 so I can utilize PLX switching the most

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 length 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 gpu slot If everything is working fine, then you should not change these settings Gen1, Gen2, Gen3 refers to PCIE , and signalling standards