Synology RackStation

RackStation 820+ RS820+ 4-core 2.1 GHz CPU, Over 1,621 MB/s sequential reading, Scale up to 8 drives
RackStation 820RP+ RS820RP+ 4-core 2.1 GHz CPU, Over 1,621 MB/s sequential reading, Scale up to 8 drives, Redundant Power
RackStation 1219+ RS1219+ Quad-core 2.4 GHz CPU, M.2 SATA SSD cache support, Scale up to 12 drives
RackStation 2418+ RS2418+ Quad-core 2.1 GHz CPU, Scale up to 24 drives, Expandable memory up to 64 GB
RackStation 2418RP+ RS2418RP+ Quad-core 2.1 GHz CPU, Scale up to 24 drives, Expandable memory up to 64 GB, Redundant Power
RackStation 2818RP+ RS2818RP+ Quad-core 2.1 GHz CPU, Scale up to 28 drives, Expandable memory up to 64 GB, Redundant Power