8GB (2x 4GB) PNY DDR3 1600MHz PC3-12800 SODIMM Memory Modules P/N 64C0JKHNJ
Pair of PNY Technologies 4GB DDR3 1600MHz PC3-12800 SODIMM memory modules with part number 64C0JKHNJ. These were swapped out of a working computer and are guaranteed to work.