Synology RS1626xs+ Xeon D-1726 4-Bay Rackmount NAS 64GB 1.6TB Cache 16TB Drives

1U 4-Bay Rackmount NAS for Enterprise Workloads

The Synology RS1626xs+ is a 1U rackmount network-attached storage server built around an Intel Xeon D-1726 six-core processor. It ships fully assembled with 64GB of DDR4 ECC memory, 1.6TB of NVMe cache on two 800GB drives, and four 4TB enterprise hard drives totalling 16TB of raw capacity. This configuration targets businesses that need virtualization, backup, surveillance and high-performance file sharing in a single validated appliance.

Dual 10GbE and PCIe Gen4 Expansion Limits

Network connectivity is provided by two built-in 10GbE RJ-45 ports plus a dedicated 1GbE out-of-band management port. A single PCIe Gen4 x8 slot allows one additional network or storage controller, but no further expansion slots exist on the main board. Drive count can grow to 16 bays only by attaching a compatible Synology expansion unit over the rear expansion port.

64GB DDR4 ECC Memory Decides Virtualization Capacity

The installed 64GB of DDR4 ECC RDIMM memory is the fixed upper limit for this unit; the platform does not support further memory upgrades. That ceiling determines how many virtual machines or containers can run concurrently and whether memory-intensive services such as deduplication remain practical. Buyers who need more RAM must select a different model.