I've only been able to boot at 1.84 on very rare occasions. I usually boot with a lower cas OCZ with a 1.8v rated voltage. My RAM will run what your running but only with high voltage, I've exceeded 2.6 volts on occasion. In any case, both the 667 and 800 are supposed to be identical but I just find my RAM needs more voltage no matter what board I use. I've actually run my lowest voltages on the BX2. I don't understand why your memory performance is degrading, luckily I have no such problems.
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