Controller	Number of Controller Module	2
CPU	CPU Model	Intel Xeon D-1521
	CPU Quantity (per controller)	1
	CPU Architecture	64-bit
	CPU Frequency	Quad Core 2.4 (base) / 2.7 (turbo) GHz
	Hardware Encryption Engine (AES-NI)
Memory	System Memory (per controller)	8 GB DDR4 ECC UDIMM
	Pre-installed Memory Module (per controller)	8 GB (8 GB x 1)
	Total Memory Slots (per controller)	4
	Expandable Memory (per controller)	64 GB (16 GB x 4)
	Notes	Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance. Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
Storage	Drive Bays	12
	Maximum Drive Bays with Expansion Unit	36 (RXD1219sas)
	Compatible Drive Type* (See all supported drives)	3.5" SAS HDD 2.5" SAS HDD 2.5" SAS SSD
	Maximum Internal Raw Capacity	192 TB (16 TB drive x 12) (Capacity may vary by RAID types)
	Maximum Raw Capacity with Expansion Units	576 TB (192 TB + 16 TB drive x 24) (Capacity may vary by RAID types)
	Maximum Single Volume Size*	200 TB (32 GB RAM required, for RAID 5 or RAID 6 groups only) 108 TB
	Hot Swappable Drive
	Notes	"Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay. The maximum raw capacity is not limited by the maximum single volume size. Synology NAS models may utilize capacities over the maximum single volume size as long as each volume created is below the limit. (Learn more) Each internal volume (may consist of multiple drives) is expandble up to 108TB (with memory less than 32GB) or 200TB (with memory equal to or greater than 32GB).
External Ports	RJ-45 1GbE LAN Port (per controller)	2 (with Link Aggregation / Failover support)
	RJ-45 10GbE LAN Port (per controller)	1
	Expansion Port	1
PCIe	PCIe Expansion (per controller)	1 x Gen3 x8 slot (x8 link)
	Add-In-Card Support	PCIe Network Interface Card (Learn more)
File System	Internal Drives	Btrfs EXT4
Appearance	Form Factor (RU)	2U
	Size (Height x Width x Depth)	88 mm x 430.5 mm x 692 mm
	Size (Height x Width x Depth) (with server ears)	88 mm x 482 mm x 724 mm
	Weight	19.7 kg
	Rack Installation Support*	4-post 19" rack (Synology Rail Kit - RKS1317)
	Notes	The rail kit is sold separately
Others	System Fan	60 mm x 60 mm x 2 pcs
	Fan Speed Mode	Full-Speed Mode Cool Mode Quiet Mode
	Easy Replacement System Fan
	Power Recovery
	Noise Level*	51.3 dB(A)
	Power Supply Unit / Adapter	500 W
	Redundant Power Supply
	AC Input Power Voltage	100 V to 240 V AC
	Power Frequency	50/60 Hz, Single Phase
	Power Consumption*	417.48 W (Access) 274.38 W (HDD Hibernation)
	British Thermal Unit	1425.45 BTU/hr (Access) 936.85 BTU/hr (HDD Hibernation)
	Notes	Noise Level Testing Environment: Fully loaded with Seagate ST8000NM0075 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology server at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%. Power consumption is measured when it is fully loaded with Seagate ST3600057SS hard drive(s).
Temperature	Operating Temperature	0°C to 35°C (32°F to 95°F)
	Storage Temperature	-20°C to 60°C (-5°F to 140°F)
	Relative Humidity	5% to 95% RH
Certification	EAC VCCI CCC RCM FCC CE BSMI
Warranty	5 Years
	Notes	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment	RoHS Compliant
Packaging Content	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 2 Quick Installation Guide X 1
Optional Accessories	D4EC-2666-8G DDR4 ECC UDIMM* D4EC-2666-16G DDR4 ECC UDIMM* Surveillance Device License Pack Expansion Unit: RXD1219sas X 2 Synology Ethernet Adapter E10G17-F2 Synology Ethernet Adapter E10G18-T1 Synology Ethernet Adapter E10G18-T2 Synology Rail Kit Sliding - RKS1317 VS360HD VS960HD