Virtual-Hideout posted a review on the Kingston HyperX 2GB PC2-6400 CL4 DDR2 memory

Overall though, taking in this kit for what it is, it's a high quality DDR2 800mhz memory kit capable of running at 900mhz @ CL4 and maybe more. It's a good looking and solid entry from Kingston and they're a name you can trust. If you're looking for a high quality DDR2 kit, give this Kingston HyperX kit a look

Kingston HyperX 2GB PC2-6400 CL4 DDR2 Review