Then I understand how you can hit 1880CLx ... still very impressive, though.

I'm wondering. Obviously the 3.4G NB clock is limited by the memory overclock, but wouldn't it make more sense to loosen up the ram and increase the NB clock to 4G+? I presume you figured that already so either you're not at those temperature levels that allow you to hit high NB clocks or I'm wrong and tight timings are just plain better.