NVME Drives explained

• NVMe can perform parallel input/output (I/O) operations with multicore processors to facilitate high throughput.
• While Advanced Host Controller Interface (AHCI), the previous PCIe interface for SSD, must communicate with the SAS/SATA controller, NVMe communicates directly with the host CPU.
• NVMe has more command queues (64,000 vs. 1) and can send more commands per queue (64,000 vs. 32) than AHCI.
• In contrast to AHCI, NVMe utilizes low CPU cycles.
• NVMe operations have a latency of 2.8 microseconds versus AHCI's 6 microseconds.
• NVMe can perform over 1 million I/O operations per second (IOPS).
• NVMe supports SSDs with a variety of types of non-volatile memory (NVM), including NAND flash and 3D XPoint technology, which was developed by Intel and Micron to bring the performance characteristics of DRAM to NVM.