Lenovo TDSourcing - DDR3L - 4 GB - DIMM 240-pin - 1600 MHz / PC3-12800 - CL11 - 1.35 V - registered - ECC - for Lenovo System x35XX M4/ x3650 M4 BD/ x3650 M4 HD/ x36XX M4/ x3750 M4/ x3850 X6/ x3950 X6