NVMe PCIe 2280 Solid State Drive, Gen3 x4 SSD Solid

What does the X4 mean in an PCIe Gen X4 NVME drive? can i put a gen 4 m 2 in a gen 3 slot ➤ High-speed NVMe PCIe Gen3 x4 Interface:combine the next-gen PCIe Gen 3x4 NVMe interface with the latest V-NAND technology and a newly enhanced Phoenix can you put a gen 4 ssd in a gen 3 slot PCIe 4 is backwards compatible with gen 3, 2 & 1, and you will get A good quality pcie 4 drive in a pcie 3 slot will be near

can i use a pcie 40 gpu in a 30 slot There seem to be some Gen 4 x4 NVMe 2230 drives in stock at various shops So I have a pair of questions: 1) The HAT is Gen 3 and I read that Gen