Samsung 4GB DDR3 Memory SO-DIMM 204pin PC3L-12800S 1600MHz M471B5273CH0-YK0 Samsung Genuine Part Number: M471B5173DB0-YK0 Description: Samsung 4GB 1Rx8 PC3L-12800S DDR3-1600MHz Low Voltage Single Rank Memory Type: DDR3 RAM / Capacity per Module: 4GB Bus Speed: PC3-12800 (DDR3-1600)