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Pemalite said:

Nope. History says otherwise.

Radeon 5870:  2.1 Billion transisters, 850mhz core clock, 40nm.
Radeon 6970: 2.6 Billion transisters, 880mhz core clock, 40nm.

By those metrics, the 6970 should use significantly more power because it's larger and has a higher clockspeed, reality plays out differently.

But, we won't know for sure untill we have them in our hands, I'll be upgrading to it regardless.

What reallity?

In fact the HD 6970 consume more power than HD 5870 when in full load... the HD 6970 only consume less than the GPU is in idle due the better power management (there are more power states and the clock is downclocked more when not in use).

And the difference is 10-20% in power consumption.