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

Differences Between M2 Cards M2 Slots Keys Sizes and Types m 2 pcie 4 0 in 3 0 slot ADT-Link PCIe x4x4x4x4 to Expansion Card 4 Slot M 19 13 US $ Price shown before tax Delivery guarantee ADT-Link PCIe x4x4x4x4 to M m2 slot You can plug pcie into slots as it's backwards compatible but the speeds will be limited to Gen 3 It wouldn't be able to go above the

m2 slot types PCIe PCIe x 16 Slots 7 · 6 · 5 · 4 · 3 · 2 · 1 SSD Slots 5 x Ultra-Fast Storage：4*PCIe x4 slots; Efficient Overall Thermal：VRM Thermal