Full Details from Amazon.com : http://www.amazon.com/gp/product/B00EFE2C3K?tag=onigi-204gb (1x4gb) Sodimm Ram Memory for Lenovo Essential B570 Notebook Series Ddr3204PIN SODIMM DDR3 SDRAM DDR3-PC10600 PC3-1333MHZ 1 SINGLE PC