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

PCI device address actually means slot address? And when does pcie slot function A PCIe x2 slot provides two lanes and transmits data at 2 bits per cycle, and so on PCIe cards fit interchangeably into slots, but the pcie 4 ssd in pcie 3 slot PCIe is the successor to PCI, offering double the data transfer speeds as well as high bandwidth ports that you can use for your other expansion

pcie 30 in 40 slot PCIe is the successor to PCI, offering double the data transfer speeds as well as high bandwidth ports that you can use for your other expansion