The 8-bay Synology DS1821+ is aimed at IT enthusiast and SMB customers looking for a powerful and scalable storage solution, its business-grade backup solutions keep users safe and protected from potential data loss, while major improvements to compute capabilities and throughput means workloads are finished faster than ever before. The DS1821+ can handle demanding application workloads and a greater number of concurrent users. Experience faster file indexing in Synology Drive, photo organization in Moments, and more responsive web services CPU Model AMD Ryzen V1500B CPU Architecture 64-bit CPU Frequency 4-core 2.2 GHz System Memory 4 GB DDR4 ECC SODIMM Memory Module Pre-installed 4 GB (4 GB x 1) Total Memory Slots 2 Drive Bays 8 Maximum Drive Bays with Expansion Unit 18 (DX517 x 2) M.2 Drive Slots 2 (NVMe) Compatible Drive Type* (See all supported drives) •3.5' SATA HDD •2.5' SATA HDD •2.5' SATA SSD •M.2 2280 NVMe SSD RJ-45 1GbE LAN Port 4 (with Link Aggregation / Failover support) USB 3.0 Port 4 eSATA Port 2 PCIe Expansion 1 x Gen3 x8 slot (x4 link) System Fan 120 mm x 120 mm x 2 pcs Power Supply Unit / Adapter 250 W AC Input Power Voltage 100 V to 240 V AC Operating Temperature 0°C to 40°C (32°F to 104°F) 3-year hardware warranty, extendable to 5-year coverage - EW201