>An NVMe device can have multiple queues and each queue can contain many requests at a time. To put this into perspective, whereas AHCI/SATA (NCQ and TCQ) has

>An NVMe device can have multiple queues and each queue can contain many requests at a time. To put this into perspective, whereas AHCI/SATA (NCQ and TCQ) has one command queue with a depth of 32 commands (SAS has a queue depth of 254 commands), NVMe is designed to have up to 65,535 queues with as many as 65,536 commands per queue.