 "Corsair XMS3 - DDR3 8 GB : 2 x 4 DIMM 240-pin" " Corsair 240-pin CMX8GX3M2A1600C9 System Memory (RAM) CDWG.com
"The XMS3 family is Corsair's mainstream line of performance DDR3 memory. These modules allow users to experience outstanding memory performance and stability." 
 "Crucial - DDR3L 4 GB DIMM 240-pin" " Crucial 240-pin CT51264BD160BJ System Memory (RAM) CDW.com
"Enhance your laptop's performance holistically with the Crucial System Memory. Ensure lag-free functioning and efficient multitasking by upgrading you system with this 4 GB DDR3 SDRAM. With Non-ECC parity and a CAS latency of CL11, it reduces delay and enables quick loading of programs. It is compatible with motherboards having 240-pin DIMM slots and DDR3-enabled chipset. Working at a supply voltage of 1.35 volts, this unbuffered system memory delivers an energy efficient performance.4 GB RAM for PC to improving your system functionalityHigh data transfer rate with a memory speed of 1600 MHz" 