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Synology 3U Rackmount 16-Bay NAS 
CPU Intel Xeon D-1541
Memory 16 GB DDR4 ECC 
External Ports : 2x 10GbE; 4x 1GbE; 2x USB 3.2 Gen 1; 
2x eSATA; 2x PCIe
Redundant Power Supply
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Product Specification : 
Synology RackStation RS4021xs+ 16-Bay Rackmount NAS / Diskless 
| Processor | CPU Model : Intel Xeon D-1541 CPU Architecture : 64-bit CPU Frequency : 8-core 2.1 (base) / 2.7 (turbo) GHz Hardware Encryption Engine : Yes (AES-NI) | 
| System Memory | 16 GB DDR4 ECC UDIMM (16 GB x 1) | 
| RAM slot | 4 | 
| RAM Max. | 64 GB (16 GB x 4) | 
| Drive Bays | 16 Bay | 
| Maximum Drive Bays with Expansion Unit | 40 Bay | 
| HDD Support | 3.5" SATA HDD 2.5" SATA SSD Hot Swappable Drive (Hard drive not included) | 
| LAN Ports | 2 x RJ-45 10GbE LAN Port 4 x RJ-45 1GbE LAN Port | 
| USB Ports | 2 x USB 3.2 Gen 1 | 
| eSATA Port | 2 | 
| PCIe Slot | 2 x Gen3 x8 slots (x8 link) | 
| IP Camera Support | Included 2 (up to 90 channels optional purchase) | 
| Power Supply Unit | Redundant Power Supply | 
| Warranty | 5 years |