Virtual-Hideout posted a review on the Kingston HyperX DDR2-8500 4x512mb (2GB) Memory

Kingston and ASUS have worked together to ensure that these two products work well together and they've done their homework. 1066MHz at 2.2v is very reasonable considering many memory companies are asking for
2.1v-2.2v for 800mhz kits!

Kingston HyperX DDR2-8500 4x512mb (2GB) Memory Review