Hiport 4GB RAM Memory For Lenovo Essential G500, G405S, G410, B590, G505S, G700, G405, G500S Touch, G505, G400S, G400, B580 Laptop Notebook Computers (4GB DDR3-1600 PC3-12800 204-pin SODIMM) Capacity: 4GB Form Factor: 204-pin SODIMM Type: DDR3-1600 PC3-12800 (non-ECC) Chipset: 2Rx8 16c 1.50V CL11