You REALLY think that, if OpenGL allowed such low level to the metal coding AMD would even bother with this whole mantle thing ?
If someone thinks logically, only real answer is, no.So, it must mean that AMD could not get same results with OpenGL.
Also as for GCN 1.0 optimizations, to me it looks its right there, not as stellar as GCN 1.1 but still , with a weak cpu you will see gains.
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