That's good news, how did you check it accurately?
I set a high static fan speed and set the core to 1410 on state 6 and 1420 on state 7. Then once the temperature stabilised and core was locked at state 7, I would reduce and increase voltages and monitor the temperatures. With previous drivers doing so had no effect whatsoever on temperatures. With these latest drivers in this same test, adjusting voltages down gives reduced temperatures and increasing voltages does the opposite (obviously).
So I can get voltage down by .2mV in state 7 at 1450 core clock and +50% on Power Levels. On paper this is an underclock but in reality it is an overclock because with default voltages it will throttle to 1400. Now it will stay at 1450 and I get lower fans speeds as a bonus. I could go the other way and keep default fan speeds and get a higher core clock. But I prefer quieter.