Originally Posted by Mad Pistol
It's the same story for Nvidia's Pascal cards, too. The overclocking is abysmal.
My take away is that the new Finfet processes have a sweet-spot to their frequencies, and anything beyond that will degrade, fast.
GP104 is 35% larger than Polaris 10 and yet clocked 50% higher. On top of that, on average it has ~10% overclocking margin at default voltages. Considering the 50% higher default clocks, I wouldn't call it's frequency capabilities as abysmal by any means. The two architectures are obviously very different, but the low frequencies are no direct consequence of GCN4 architecture. The changes in GCN4 architecture wise are quite minimal. And yet GCN2 based Bonaire on 28nm bulk process can match or exceed the clocks of Polaris 10.
FinFets indeed do have a narrow "sweet spot" and Polaris 10 missed it by a large margin (> 266MHz).