2 x 4GB Samsung 8GB PC3-12800 (DDR3-1600). 1600MHz DDR3 SDRAM SO-DIMM RAM Module

DDR3-1600 PC3-12800 12800 MB/s 1600. DDR3 Specs. Peak Transfer Rate. It will works fine with lower speed 800MHz, 1066MHz, 1333MHz. Data transfers/second (in millions).

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