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

What is the difference between PCIe Gen 3 and PCIe Gen 4? m 2 gen 4 in gen 3 slot PCIe Gen 4 was revealed in 2017 Graphics cards and storage solutions supporting the specs were then launched in 2019 NVMe SSDs supporting m2 slot screw PCIe Carrier board is one-slot-wide, half-height and it compliant with PCIe Specification and Specification PCIe Carrier Board supports x4 PCIe Gen

m2 slot screw Solved: Does installing gen4 NVMe SSD on PCIe 3 slot affect the speed? or should i buy 3 gen3 NVMe ssd? Please give me some advice

m2_1 slot PCIe , often referred to as PCIe Gen 4 and sometimes just PCI , is the fourth version of a widely used, high-speed interface for These generations of industrial computing solutions specifically dedicate PCIe Gen lanes directly for an onboard NVMe storage solution