Corsair CMSO4GX3M1C1600C11 4GB (1x4GB) 204pin DDR3L SODIMM, 1600MHz, 1.35V, 11-11-11-28 memory. The Corsair CMSO4GX3M1C1600C11 ValueSelect memory is tested to Corsair's tough standards and is stable, reliable, and compatible with virtually all major notebook and netbook PCs. Backed by a limited lifetime warranty.