This ensures that a 12 GB/s SSD does not drain a laptop's battery in two hours.
While the base PCIe 5.0 specification doubled the data rate from PCIe 4.0 (16 GT/s to 32 GT/s), simply dropping a PCIe 5.0 controller onto an old M.2 Rev 4.0 connector would result in signal failure. Rev 5.0 v1.0 addresses three critical pillars: pci express m.2 specification revision 5.0 version 1.0 pdf
The document defines:
: Doubles the transfer rate of PCIe 4.0, reaching up to 16 GB/s for a standard x4 M.2 SSD. This ensures that a 12 GB/s SSD does