Seems true.

Using WattMan, I reduced voltage (microscopically), reduced allowable GPU temperature 5C, and increased allowable power draw 20 percent -- while setting the max clock to 1300GHz (from 1266).

Now, a card that cycled between roughly 1150+ to 1260 runs almost constantly at 1300 (during a game) and runs cooler.

The 4GB RX-480 is looking better and better for the money (on paper). So far, nothing I've run has used more than 2GB of RX-480 RAM. I assumed the 8GB RAM was overkill -- so far, it is -- 4GB seems enough (at least for 1440p in my recent games).