A-Data USA 8 GB 2000MHz Gaming Series V.2.0 2200 (PC3 17600) 240-Pin DDR3 SDRAM (2x4 GB) 4 Dual Channel Kit Memory AX3U2000GC4G9B-DG2 Cas Latency 9-11-9-27 Strictly tested memory chips Thermal Conductive Technology, Immediately dispersing heat away from the heat source 2000MHz 2x4GB 2 Oz double-coper PCB, improve current transfer rates efficiently while lowering system temp and increasing stability 2000MHz 2x4GB Thermal Conductive Technology, Immediately dispersing heat away from the heat source 2 Oz double-coper PCB, improve current transfer rates efficiently while lowering system temp and increasing stability Strictly tested memory chips Cas Latency 9-11-9-27 Lifetime Warranty