Please note: 1.There have 2 type(DDR3 1.5V / DDR3L 1.35V) available, please confirm before order. 2.If your computer not support high frequency it will downclocking to compatible one. 3.Because of the arrival batches of different products, the production date and specific models and serial number is differnet. The picture shown on the mainsite is for referents. if there is fluctuation, according to the real object please!