4GB G.Skill DDR3 PC3-14900 RipjawsX Series for Intel Z68/P67 (9-10-9-28) Dual Channel kit 4GB DDR3 PC3-14900 Dual channel kit 2x2GB 1866MHz CL9 (9-10-9-28) For Intel Z68 and P67 platforms 240 pins 1.5V