IN EXCELLENT WORKING AND COSMETIC CONDITION SK Hynix 4GB HMT451S6BFR8A-PB N0 AA PC3L-12800S-11-13-B4 Laptop Memory Brand: SK Hynix MPN: HMT451S6BFR8A Type: DDR3 SDRAM Bus Speed: PC3-12800 (DDR3-1600) Form Factor: DIMM 204-pin Capacity per Module: 4GB Number of Modules: 1 Item was removed from a working laptop and has been fully tested.