What does the X4 mean in an PCIe Gen X4 NVME drive?

NVMe SSDs, even the last-gen PCIe Gen 3-based NVMe SSDs, are immensely faster than this There's no point in getting a sick Gen 4 NVMe

Card capacity and size · Slot 1: gen 4, up to x16 lanes · Slot 2: gen 4,up to x16 lanes · Slot 3: gen 4, up to x8 lanes

m2 slot mainboard PCIe 4 is backwards compatible with gen 3, 2 & 1, and you will get at least the same performance from putting a drive in a slot as

m24 slot Transcend's PCIe SSD 240S is an solid-state drive for media production, gaming, and enterprise use Utilizing the PCI Express® Gen4 x4 interface