Results are the same with either. Cleared out the registry keys so that wattman shows the agreement screen again to confirm this.
It looks like the issue with the newer drivers is present when using multiple monitors. It holds the ram at full speed, and is unable to change it dynamically. I can set my desired speed in wattman and reboot, and they'll actually take effect. Or, if I go down to one monitor and let the ram drop to idle clocks (150mhz), it will then take the set speed next time it clocks up.