Full Details on Amazon.com : http://www.amazon.com/gp/product/B00DRFXHAU?tag=tsukuyomi-204GB (1X4GB) SODIMM RAM Memory for Lenovo ThinkPad X230 Tablet Series LTMEmory204PIN SODIMM DDR3 SDRAM PC3-12800 1600MHZ 1 SINGLE PC