The important thing to note is that x6's are built to max out the Phenom II process with turbo, so they're already running close to max volts just to achieve turbo states. they ramp up voltage on their own so be sure you know what your peak voltage is. If you're saying your chips max load volts are around 1.49v you can get away with that just fine. Anything past that and you might start noticing some odditie's but you should be able to reach max clocks at those volts though.