G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL7D-4GBRM 4GB DDR3 1600MHz Dual Channel kit Low latency CL7 kit Suitable for Intel P55 chipset Timings 7-8-7-24, 1.6V PC3-12800 specification