G.SKILL NS 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Desktop Memory Model F3-10600CL9D-4GBNS 4GB DDR3 1333MHz memory kit (2x 2GB) G.Skill NS Value Range Dual Channel kit Rated 9-9-9-24 at 1.5V Excellent choice for mainstream computing