Nvme Spec -

: Unlike SATA, which has a single queue with 32 commands, NVMe supports up to 65,535 queues , each capable of holding 65,535 commands .

The core innovation of NVMe is its rejection of the legacy Advanced Host Controller Interface (AHCI) command set. AHCI, designed for HDDs, supports a single command queue with a depth of 32 entries. While adequate for slow mechanical storage, this creates a severe bottleneck for parallel flash memory, which can service hundreds of simultaneous operations. nvme spec

: Defines the foundational protocol, including the register interface, command sets, and the submission/completion queue mechanism. : Unlike SATA, which has a single queue