Newcomer AMD Radeon HD 7970 GHz Edition probably has "new special faking feature". It is own secret "GPU Boost" technic. AMD driver/GPUz reports different frequencies than they really are! GPU clocks of "GHz edition" are 1.0-1,1 GHz (some vendors has 1,05 or 1,075 MHz) AMD gave them a free hand in this. But there is impossible to check real frequencies, AMD keeps it masked by driver. Stay tuned ... we will prove it later. Card is here ... awaiting for detailed testing.
Update 1: Its look like, GPU is working @ 1,1+ GHz instead of 1050 MHz reported in driver/GPUz/utilities. Performance is pretty higher then classic HD 7970@1,05 GHz! Power consumption/heat/noise corresponds to these higher clocks! Stay Tuned .