Power consumption was measured after 5 minutes of load under three scenario: Furmark, Unigine Heaven and desktop idle in sequential order with 2 minutes of downtime in between each test. The measurement was taking using an Energenie ENER007 power meter and measured for the whole system at the power supply, excluding the monitor.
While Furmark and desktop idle provide stable and consistent power read-outs, Unigine Heaven does not so the power reading is taken as the peak value that occurs in Scene 2 of 26.
Power consumption jumped only by 25 watts for the Gigabyte card over Nvidia's reference card but push those clocks further, such as by enabling Gigabyte's OC mode, and it starts to increase into the mid-300 region.
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