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True but in fairness our AMD reference card here boost at 1570MHz and generally holds that speed, which I believe is above their advertised boost clock.
The Asus is advertised at 1590Mhz which it does hit for a few seconds, after thirty minutes or so of gaming and benchmarks in a closed case the boost clock is hovering around 1400MHz to keep temperatures under control.
The main advantage of the Asus its one of the quietest we have ever tested.
1570's an excellent result, was that a reference AIO though? None of mine have managed that out of the box and I've got good case ventilation with a C70 Vengeance. With tweaks and a voltage drop I can get that and if I really push the settings I can get the card to overclock to 1650-1660 but it never actually runs that high for long before setting down to around the Red Devils 1607 boost.
It'd be interesting to know if the Devil lacks anything under the hood if you ever get the chance.