The Samsung 4 GB DDR3 SDRAM (1600 MHz PC3-12800) SODIMM Module is a reliable memory solution for your computer. It boasts one of the best performance-to-power efficiency ratios on the market, featuring 30 nm technology that uses up to 47% less power than 60 nm memory. The module contains 4.0 GB of Samsung DDR3 SDRAM that offers data delivery at 800 Mbps, frequencies of 400 to 800 MHz, and write speeds of 1600 MHz (PC3-12800).