Full Details from Amazon.com : http://www.amazon.com/gp/product/B00CWMA3OM?tag=onigi-208GB (2X4GB) SODIMM RAM Memory 4 IBM Lenovo ThinkPad T500 W500 Notebook Series DDR3204PIN SODIMM DDR3 SDRAM DDR3-PC10600 PC3-1333MHZ 2PCS KIT