For dual-DIMM configuration, you must use a pair of identical DDR4 modules
Storage:
Flash Memory: 5GB (Dual boot OS protection)
Drive Bay: 5 x 3.5-inch + 4 x 2.5-inch
Drive Compatibility:
3.5-inch bays:
3.5-inch SATA hard disk drives
2.5-inch SATA solid state drives
2.5-inch bays:
2.5-inch SATA solid state drives
2.5-inch U.2 NVMe PCIe Gen3 x4 solid state drives (2.5-inch Bay #1 & #2)
2.5-inch bay #1 & #2 support either U.2 NVMe SSDs or SATA 6Gb/s SSDs.
** U.2 NVMe solid-state drives can only be installed in 2.5-inch bay numbers 1 and 2. Installing these drives in other bays will damage the drive connectors.
Hot-swappable: Yes
SSD Cache Acceleration:
Support: Yes
Ethernet Ports:
2.5 Gigabit Ethernet Port (2.5G/1G/100M): 2
10 Gigabit Ethernet Port: 1 x 10GBASE-T (10G/5G/2.5G/1G/100M)