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The GeForce GTX 680 consumed 4% less power than the Radeon HD 7970 and 10% less than the 7970 GHz Edition. The GeForce GTX 670 used 4% more power than the Radeon HD 7950 and roughly the same amount as the 7950 Boost.
The GeForce GTX 660 Ti consumed almost 4% more power than the Radeon HD 7950 and 11% more than the 7870. Meanwhile the GeForce GTX 660 used just 3% less power than the Radeon HD 7950 but 4% more than the 7870.
The GeForce GTX 650 Ti used roughly the same amount of power as the Radeon HD 7870 making it 14% more power hungry than the 7770.