DDR3L / DDR3 1600MHz PC3L-12800 / PC3-12800 240-Pin Unbuffered Non-ECC 1.35V / 1.5V CL11 Dual Rank 2Rx8 based 256x8 Module Size: 4GB Package: 1x4GB ; 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 For DDR3 Desktop Compatible with Intel and AMD CPU, Not for Laptop Guaranteed Lifetime warranty from Purchase Date and Free technical support based on United States