Full Details from Amazon.com : http://www.amazon.com/gp/product/B009V1DQXC?tag=onigi-20
8GB 2X4GB Memory RAM for HP HDX Series 18t 200pin 800MHz PC2-6400 DDR2 SO-DIMM Black Diamond
Brand new certified 200pin PC2-6400 800MHz DDR2 SO-DIMM Black Diamond Memory
Low density 8GB 2X4GB memory kit 2 sticks of memory module dual channel supported memory module
100 compatible garrantee for HP HDX Series 18t
100 pre-tested on HP system to ensure functionality
Lifetime warranty