G.SKILL 8GB (2 x 4GB) Ripjaws X Series DDR3 1600MHz PC3-12800 240-Pin Desktop Memory Model F3-12800CL8D-8GBXM 8GB DDR3 PC3-12800 Dual channel kit 2x4GB 1600MHz CL8 (8-8-8-24) For Intel Sandy Bridge platform 240 pins 1.5V