G.SKILL Ripjaws X Series 8GB (2 x 4GB) Desktop Memory, 240-Pin DDR3 SDRAM, 1600 MHz, PC3 12800 (F3-12800CL9D-8GBXL) 8GB DDR3 PC3-12800 Dual channel kit 2x4GB 1600MHz CL9 (9-9-9-24) For Intel Sandy Bridge platform 1.5V, 240 pins