Kingston HyperX PC5400
 

Kingston has delivered high performance DDR2 memory that does not
dissapoint when run through its paces. Although we could not reach the
true top end of the memory, I think we realize this is not a bad thing,
leaving us to worry about other bottlenecks. While stock performance is
basically on par with DDR memory, the overclocking results are more than
promising.

http://www.viperlair.com/reviews/mem.../DDR2/hyp5400/