Product Detail 4GB Dual Channel kit (2x2GB) PC3-12800 1600MHz CL8 (8-8-8-24) 240 pins . The "G.Skill Trident Series F3-12800CL8D-4GBTD - Memory - 4 GB : 2 x 2 GB - DIMM 240-pin - DDR3 - 1600 MHz / PC3-12800 - CL8 - 1.65 V - unbuffered - non-ECC" is best product for you. We recommended G.Skill Trident Series F3-12800CL8D-4GBTD - Memory - 4 GB : 2 x 2 GB - DIMM 240-pin - DDR3 - 1600 MHz / PC3-12800 - CL8 - 1.65 V - unbuffered - non-ECC