What is the difference between PCIe Gen 3 and PCIe Gen 4?

pcie slot configuration gen1 gen2 gen3   Dan pcie slot bracket

PCIe supports PCIe Gen 1, PCIe Gen 2, and PCIe Gen 3 devices PCIe With options for 1x, 2x, 4x, 8x, and 16x slot configurations

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 Slot power · x1 cards are limited to A at +12 V and 10 W combined · x4 and wider cards are limited to A at +12 V and 25 W combined · A full-

mega228 slot PCIE 1x, 4x, 8x, 16x bus pins and signals Pinouts > Computer buses and slots connectors · 36 pin PCI-Express x1 connector layout 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