SK Hynix HMT451S6DFR8A 8GB (2x4GB) 1Rx8 DDR3 SO-DIMM PC3L-12800S 1600MHz 204-Pin Non-ECC CL11 1.35V Laptop Memory 2-Piece Kit HMT451S6DFR8A-PB for Other Laptop Systems at Amazon.com
A-Tech 4GB RAM Replacement for Hynix HMT451S6BFR8A-PB | DDR3/DDR3L 1600MHz PC3L-12800 1Rx8 1.35V SODIMM 204-Pin Memory Module at Amazon.com
OWC 8GB PC3-12800 DDR3L 1600MHz SO-DIMM 204 Pin CL11 Memory Module Upgrade Compatible with iMac, Mac Mini, and MacBook Pro (OWC1600DDR3S8GB) at Amazon .com