WebMay 14, 2024 · Designed from the ground up for SSDs, the NVM Express ® (NVMe ®) base specification was initially created to help define how host software communicates with non-volatile memory across a PCI Express ® (PCIe ®) bus. It has quickly evolved into the industry standard for PCIe solid state drives (SSDs) in many form factors (U.2, M.2 ...