DTM68619-S is a non-ECC Unbuffered small-outline 4Gx64 memory module, which conforms to JEDEC's DDR4-2666V, PC4-2666V standard. The assembly is Dual-Rank containing: sixteen 2Gbx8 DDR4-2666 Samsung SDRAMs. One 4K-bit EEPROM is used for Serial Presence Detect.
Both output driver strength and input termination impedance are programmable to maintain signal integrity on the I/O signals in a Fly-by topology.