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NVM Express, NVMe, or Non-Volatile Memory Host Controller Interface Specification, is a specification for accessing solid-state drives attached through the PCI Express bus. "NVM" stands as an initialism for non-volatile memory, which is used in SSDs. As a logical device interface, NVM Express has been designed from the ground up, capitalizing on the low latency and parallelism of PCI Express SSDs, and mirroring the parallelism of contemporary CPUs, platforms and applications. By allowing parallelism levels offered by SSDs to be fully utilized by host's hardware and software, NVM Express brings various performance improvements.
NVM Express SSDs exist both in form of standard-sized PCI Express expansion cards and as 2.5-inch drives that provide a four-lane PCI Express interface through the U.2 connector. SATA Express storage devices and the M.2 specification for internally mounted computer expansion cards also support NVM Express as the logical device interface.


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