The OpenGL Speed & Performance-Per-Watt From The Radeon RX 480 To Radeon HD 4850/4870
Here are the Metro Redux tests that make use of OpenGL 4 and thus only could run with the HD 5800/6900 GPUs and GCN hardware.
The performance-per-Watt from the HD 5830 to RX 480 has doubled.
The Metro Last Light Redux results also show nicely how the performance-per-Watt has improved.