DDR4 SO-DIMM high-speed, memory module that uses 8pcs of 512Mx8、1024M x 8、2GX8 bits DDR4 SDRAM in FBGA package and a 4K bits Serial EEPROM on a 260-pin printed circuit board. DDR4 SO-DIMM is a Dual In-Line Memory Module and is intended for mounting into 260-pin edge connector sockets. Synchronous design allows precise cycle control with the, use of a system clock. Data I/O transactions are possible, on both edges of DQS. Range of operation frequencies, and programmable latencies allow the same device to be useful for a variety of high bandwidth, high-performance memory system applications.