Full Details from Amazon.com : http://www.amazon.com/gp/product/B00JQQA4HI?tag=onigi-20
Hiport 4GB RAM Memory For Lenovo Essential G500 G405S G410 B590 G505S G700 G405 G500S Touch
Capacity 4GB
Form Factor 204-pin SODIMM
Type DDR3-1600 PC3-12800 non-ECC
Chipset 2Rx8 16c 150V CL11