 "Crucial SO-DIMM 204-pin 4 GB DDR3L SDRAM" " Crucial SDRAM - CT51264BF160B System Memory (RAM) CDW.com
"Help your laptop perform at its best. Designed to help your laptop run faster and smoother, a Crucial memory upgrade is one of fastest, most affordable, and easiest ways to improve your system's performance. Crucial memory empowers your laptop to achieve faster application loading times, faster system responsiveness, and increased ability to multitask and handle data-intensive programs. What does this mean? Spend less time staring at loading screens and more time getting stuff done. Crucial laptop modules are rigorously tested at both the component and module levels to ensure that your memory meets the stringent compatibility and performance standards. Every module Crucial manufactures is inspected by the Systems Compatibility Group before it leaves the doors. At a fraction of the price of your laptop, an investment in Crucial memory helps your system get up to speed." 
 "HyperX FURY - DDR3 4 GB DIMM 240-pin" " HyperX 240-pin HX316C10F/4 System Memory (RAM) CDWG.com
"HyperX FURY DDR3 memory automatically overclocks for hassle-free, plug-and-play functionality that gets you in the game faster and instant top-level performance that helps you win it. It draws less power and generates less heat. Its asymmetric, aggressive design lets you stand out from the crowd of squared designs and features quality aluminum and a diamond-cut finish." 