Corsair Memory is specifically designed for rock-solid stability in demanding applications. Data lines are carefully engineered for noise immunity; clock lines are optimized for minimum skew. All modules use JEDEC-compliant six-layer. Corsair XMS3 4GB DDR3 SDRAM Memory Module (4GB 2 x 2GB - 1600MHz DDR3-1600/PC3-12800 - Non-ECC - DDR3 SDRAM - 240-pin DIMM - MPN: CMX4GX3M2A1600C9)