GideonTech.com posted a review on the Kingston HyperX 2GB PC2-6400 Kit

Kingston Technology was kind enough to send over some of their evaluation DDR2 RAM to test out. The RAM kit that came in, is the KHX600D2K2/2G; for those of you who aren't versed in Kingston product nomenclature, this is a 2GB Kit made up of two 1GB 128M x 64-bit PC2-6400 CL5 240-pin DIMM modules. Each of the modules has been tested to run at DDR2 800MHz with the low latency timings of 5-5-5-15 at 2.0v.

Kingston HyperX 2GB PC2-6400 Kit Review