The DiskStation DS723+ is a 2-bay business NAS with a Ryzen R1600 CPU. In addition to the two M.2 cache slots on the main unit, if you use the optional unit DX571, you can expand the drive bay by 5 bays and install up to seven 2.5/3.5 inch HDD/SSD. 

DDR4 ECC 2GB (maximum 32GB), USB 3.2 Gen 1 x 1, eSATA x 1, and Gigabit LAN x 2 are the main specifications. The cooling fan measures 92 mm x 1, has external dimensions of 106 mm width, 223 mm depth, 166 mm height, and weighs 1.51 kg.

DS223 DiskStation
DiskStation DS223 "DiskStation DS223" is a 2-bay business NAS with a Realtek RTD1619B CPU. DDR4 2GB memory, USB 3.2 Gen 1 x 3 interfaces, and Gigabit LAN x 1 are the main specifications. The cooling fan measures 92 mm 1, has external dimensions of 108 mm width, 232.7 mm depth, 165 mm height, and weighs 1.28 kg.

SA3610 SA3610 SA3610/SA3410 "SA3610" is a 2U rackmount NAS with an Intel Xeon D-1567 CPU. The drive bays are 2.5/3.5 inch SAS/SATA x 12, and up to seven optional 12-bay expansion units can be used to install 96 drives.

DDR4 ECC 16GB (maximum 128GB) memory, USB 3.2 Gen 1 x 2, expansion port x 1, 10 Gigabit LAN x 2, Gigabit LAN x 4, Gigabit LAN x 1 are the main specifications (out-of-band management supported). The cooling fan is 80 mm 4, the external dimensions are 482 mm wide, 724 mm deep, 88 mm high, and the weight is 14.5 kg.

The "SA3410" is a 2U rackmount NAS with an Intel Xeon D-1541 CPU. The drive bays are 2.5/3.5 inch SAS/SATA x 12, and 96 drives can be installed by adding up to 7 optional 12-bay expansion units.

DDR4 ECC 16GB (maximum 128GB) memory, USB 3.2 Gen 1 x 2, expansion port x 1, 10 Gigabit LAN x 2, Gigabit LAN x 4, Gigabit LAN x 1 are the main specifications (out-of-band management supported). The cooling fan is 80 mm 4, the external dimensions are 482 mm wide, 724 mm deep, 88 mm high, and the weight is 14.5 kg.