DiskStation DS1621+ 48TB Features: Accelerated Performance. 174% higher 4K random read IOPS and 76% faster sequential write speeds compared to its predecessor Maximize Performance. Turbocharge HDD arrays without occupying drive bays using dual built-in M.2 slots for NVMe SSD cache Easy Storage Expansion. Scale-up on-demand to 16 drives with two DX517 expansion units Includes Everything to Protect Your Data. Back up critical data to and from public clouds, Windows PCs and servers, virtual machines, and data on the NAS with Synology Active Backup suite, Hyper Backup, and Snapshot Replication Ready for 10/25GbE. Supports 10GbE SFP+ / RJ-45 and 25GbE SFP28 NICs to instantly increase network bandwidth based on your infrastructure Specifications: CPU CPU Model AMD Ryzen V1500B CPU Quantity 1 CPU Architecture 64-bit CPU Frequency 4-core 2.2 GHz Hardware Encryption Engine (AES-NI) Yes Memory System Memory 4 GB DDR4 ECC SODIMM Memory Module Pre-installed 4 GB (4 GB x 1) Total Memory Slots 2 Maximum Memory Capacity 32 GB (16 GB x 2) Storage Drive Bays 6 Maximum Drive Bays with Expansion Unit 16 (DX517 x 2) M.2 Drive Slots 2 (NVMe) Compatible Drive Type 3.5" SATA HDD 2.5" SATA HDD 2.5" SATA SSD M.2 2280 NVMe SSD Maximum Single Volume Size 108 TB Hot Swappable Drive Yes External Ports RJ-45 1GbE LAN Port 4 (with Link Aggregation / Failover support) USB 3.2 Gen 1 Port 3 eSATA Port 2 PCIe PCIe Expansion 1 x Gen3 x8 slot (x4 link) File System Internal Drives Btrfs EXT4 External Drives Btrfs EXT4 EXT3 FAT NTFS HFS+ exFAT Appearance Size (Height x Width x Depth) 166 mm x 282 mm x 243 mm Weight 5.1 kg Others System Fan 92 mm x 92 mm x 2 pcs Fan Speed Mode Full-Speed Mode Cool Mode Quiet Mode Easy Replacement System Fan Yes Brightness Adjustable Front LED Indicators Yes Power Recovery Yes Noise Level 25.2 dB(A) Scheduled Power On / Off Yes Wake on LAN / WAN Yes Power Supply Unit / Adapter 250 W AC Input Power Voltage 100 V to 240 V AC Power Frequency 50/60 Hz, Single Phase Power Consumption 51.22 W (Access), 25.27 W (HDD Hibernation) British Thermal Unit 174.77 BTU/hr (Access), 86.22 BTU/hr (HDD Hibernation) Temperature Operating Temperature 0°C to 40°C (32°F to 104°F) Storage Temperature -20°C to 60°C (-5°F to 140°F) Relative Humidity 5% to 95% RH Certification FCC CE BSMI EAC CCC KC VCCI RCM Warranty 3 years Environment RoHS Compliant Packaging Content Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 RJ-45 LAN Cable X 2 Quick Installation Guide X 1