Increases system performance</br>Easy to install</br>Premium quality memory from a trusted brand</br>DDR3 & DDR3L are the same thing (DDR3L stands for DDR3 Low voltage and applies to our 1.35V DRAM)</br>This is a dual voltage piece and can operate at 1.35V or 1.5V</br></br>Product Description</br></br>CT51264BF160B is a single 4GB DDR3/DDR3L ( Both are same item )Notebook module that operates at speeds up to 1600 MT/s and has a CL11 latency. It is dual voltage and can operate at 1.35V or 1.5V. It is Unbuffered and is non-ECC. It conforms to the industry standard SODIMM layout of 204 pins and is compatible with computers that take DDR3 SODIMM memory.</br><br/>http://www.amazon.com/gp/product/B005LDLV6S