What is the Difference Between PCIe Gen 3 & Gen 4?

can i put a gen 4 m 2 in a gen 3 slot   Dan can you use a pcie 40 nvme in a 30 slot

Two types of PCIe slot on an Asus H81M-K motherboard Various slots on a computer motherboard, from top to bottom: PCI Express x4; PCI Express x16; PCI Express

PCIe Size and Lanes · PCIe x1: a single PCIe lane does not support the interface] · PCIe x4: NVMe SSDs occupy a single x4 slot] · PCIe x8: expansion cards Otherwise, you will not be able to insert your PCIe card into the slot physically For example, a PCIe x4 SSD card can fit in a PCIe x4

mando slot If i use 1TB gen4 card into gen4 slot and 500gb gen4 into gen3 slot, can both of gen4 card run together smoothly?? putting the SSD in a USB 3 PCIe supports PCIe Gen 1, PCIe Gen 2, and PCIe Gen 3 devices PCIe Gen 4 will be compatible with PCIe Gen 5 A PCIe Gen 4 device, however, will