DDR3L / DDR3 1600MHz PC3L-12800 / PC3-12800 204-Pin Unbuffered Non-ECC 1.35V / 1.5V CL11 Dual Rank 2Rx8 based 256x8 Module Size: 16GB KIT(4x4GB Modules) Package: 4x4GB ; JEDEC standard 1.35V, this is a dual voltage piece and can operate at 1.35V or 1.5V PCB Color may be different (Black or Green) due to different production batches; all Timetec products are high quality and rigorously tested to meet stringent standards