PCIe Gen 4 vs Gen 3: Do you need to spend extra on SSDs?

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Looking at Amazon there is PCIe Gen 3 NVME and PCIe Gen 4 NVME for sale I don't see this even mentioned on the Wikipedia page for NVM Express

➤ High-speed NVMe PCIe Gen3 x4 Interface:combine the next-gen PCIe Gen 3x4 NVMe interface with the latest V-NAND technology #2 Gigabyte AORUS NVMe Gen4 SSD The most distinctive feature of Gigabyte AORUS NVMe PCIe SSD is the full-body copper heat spreader, which

elite forces slot edited Jul 4, 2023 at 3:16 Ashu asked Jun 26, 2023 at Is a half-length PCI Express x8 Gen 3 card compatible with a PCIe x4 Gen3 slot? Hi there, I'm trying my first build and I bought a samsung 980 PCIe NVMe SSD which is a PCIe Gen x4, NVMe interface