Unigine Heaven continues to serve as the most demanding Linux OpenGL benchmark at this point. The Radeon HD 7950 results were all quite favorable with Unigine Heaven, even at 2560 x 1600.
Again, you can see how your own Linux OpenGL performance compares to this hardware/software combination by running phoronix-test-suite benchmark 1203223-BY-RADEONHD720.
As far as the thermal results go, the XFX Radeon HD 7950 Black 3GB (XFX FX-795A-TNBC) was operating on average about 5°C warmer than the Sapphire Radeon HD 6950 when running Unigine Heaven.
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