I'll also confirm that AMD PowerPlay (the thing that downclocks AMD cards when they aren't in use) does not work with Cliffs of Dover at all. It is like it does not consider Cliffs of Dover to be a 3D game.
My GPU/Memory clocks registered as 500Mhz/500Mhz using GPU-Z sensor logging. Their normal clocks during 3D gaming are 750Mhz/900Mhz.
Overclocking the clocks using Overdrive in the CCC will not have any effect as it does not disable PowerPlay which is what controls the GPU and memory clocks. Only forcing settings for the clocks using a third-party utility will get around this.
I'm quite annoyed learning about this today. Its clear that this game was not tested with any AMD cards at all. Its time to get out of bed with Nvidia now.
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