The DS1621+ has a PCIe 3.0 x8 slot for 25GbE networking
The DS1621+ supports up to two DX517 expansion units (10 extra bays) and the PCIe 3.0 x8 slot can handle a 10GbE or 25GbE network card or M.2 NVMe adapter.
The DS1621+ supports up to two DX517 expansion units (10 extra bays) and the PCIe 3.0 x8 slot can handle a 10GbE or 25GbE network card or M.2 NVMe adapter.