Is the 1TB M.2 NVMe SSD used for caching, and if so, how does it enhance the performance of the NAS server?

The 1TB M.2 NVMe SSD is used for ultra-fast storage, which typically suggests it could be used for cache acceleration to enhance performance.

Questions & Answers: Synology DiskStation DS1621+ NAS Server with Ryzen 2.2GHz CPU, 32GB Memory, 72TB HDD Storage, 1TB M.2 NVMe SSD, 4 x 1GbE LAN Ports, DSM Operating System

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Synology DiskStation DS1621+ NAS Server with Ryzen 2.2GHz CPU, 32GB Memory, 72TB HDD Storage, 1TB M.2 NVMe SSD, 4 x 1GbE LAN Ports, DSM Operating System

DiskStation DS1621+, made for variety of server roles, like iSCSI targets backup, large file storage, email servers, & domain controllers. Powerful, high-capacity scalable storage capable of fitting into environments with intensive, multi-user workloads
Ryzen V1500B Quad-Core 2.2GHz CPU; 32GB DDR4 ECC SODIMM Memory; M.2 Storage: 1TB (2 x 500GB) M.2 Solid State Drives for Ultra-Fast Storage; File Storage: 72TB (6 x 12TB) SATA 3.5" HDDs for High-Capacity Storage; 4 x RJ-45 1GbE LAN Ports (with Link Aggregation / Failover support); 3 x USB 3.2 Ports; 2 x eSATA Ports
Features: iSCSI Target Protocol, Cache Acceleration, Virtual Machine Manager, High Availability, MailPlus, Central Management System, Security Advisor, AES 256-bit Encryption, 2 Factor Authentication, Cloud Station Suite, 4K Multimedia Server role, Active Backup, Surveillance Station role, Collaboration Suite, & more
Comes in sealed box
Hard drives & memory upgrades included separately, NOT installed, installation required

$4,699^.00 –