Synology RS4021xs+ Rackstation 3U 16-Bay NAS (Xeon D-1541 8 Core 2.7Ghz, 16GB DDR4 ECC RAM, 4x GbE, 2x 10GbE)

Compute
Intel® Xeon® D-1541 8-core 2.7 GHz

Networking
Built-in dual-port 10GbE

Memory
16 GB ECC DDR4 Up to 64 GB

Scalability
Up to 40 drive bays with RX1217RP/RX1217

Hardware Specifications

CPU

CPU Model : Intel Xeon D-1541
CPU Quantity : 1
CPU Core    : 8
CPU Architecture :64-bit
CPU Frequency : 2.1 (base) / 2.7 (turbo) GHz
Hardware Encryption Engine : Yes    

Memory

System Memory : 16 GB DDR4 ECC UDIMM
Memory Module Pre-installed : 16 GB (16 GB x 1)
Total Memory Slots : 4
Maximum Memory Capacity : 64 GB (16 GB x 4)

Storage

Drive Bays : 16
Maximum Drive Bays with Expansion Unit : 40 (RX1217 x 2)
Compatible Drive Type* (See all supported drives)    
• 3.5" SATA HDD
• 2.5" SATA SSD
Hot Swappable Drive*     : Yes

External Ports

RJ-45 1GbE LAN Port : 4
RJ-45 10GbE LAN Port :2
USB 3.2 Gen 1 Port*    : 2
Expansion Port : 2
Expansion Port Type    : Infiniband

Notes: The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.

PCIe
PCIe Expansion : 2 x Gen3 x8 slots (x8 link)

Appearance

Form Factor (RU) :3U
Size (Height x Width x Depth) : 132.3 mm x 482 mm x 656.5 mm
Weight : 17.4 kg
Rack Installation Support* : 4-post 19" rack (Synology Rail Kit – RKS-02)

Notes
The rail kit is sold separately

Others

System Fan : 80 mm x 80 mm x 3 pcs
Fan Speed Mode    
• Full-Speed Mode
• Cool Mode
• Quiet Mode
Easy Replacement System Fan : Yes    
Power Recovery : Yes    
Noise Level* : 44.7 dB(A)
Scheduled Power On / Off : Yes    
Wake on LAN / WAN    : Yes
Power Supply Unit / Adapter : 800 watts | 550 watts*
Redundant Power Supply :  Yes
AC Input Power Voltage : 100 V to 240 V AC
Power Frequency : 50/60 Hz, Single Phase
Power Consumption : 145.79 watts (Access) | 62.68 watts (HDD Hibernation)
British Thermal Unit : 497.14 BTU/hr (Access) | 213.74 BTU/hr (HDD Hibernation)

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

Warranty
5 Years