Corsair XMS3 4 GB Dual Channel DDR3 Core i3, i5, i7 Memory Kit CMX4GX3M2A1600C7 Ultra-high performance 4 GB XMS3 DDR3 kit for Intel Core i3, i5, i7 Dual Channel Channel processors 1600MHz, 7-8-7-20, 1.65V, with Intel XMP support Two matched 2 GB modules for use in high performance Intel Core i3, i5, i7 Dual Channel systems Intel XMP (Extreme Memory Profile) Support Backed by Corsair: A respected name with a passion for quality products, and great service and support. Memory Type: DDR3; Speed: 1600MHz