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To test power consumption today we are using a Keithley Integra unit and we measure power consumption from the VGA card inputs, not the system wide drain. We measure results while gaming in Crysis Warhead and record the results.
In such an energy aware climate, AMD are making a big deal out of their new ‘ZeroCore Power’ technology. Many solutions today use power gating, clock gating and memory compression to reduce idle power requirements, but ZeroCore power technology can completely power down the core GPU while the rest of the system remains active.
Power consumption is very good, averaging around 65 watts when gaming. When compared to the HD6790, the new HD7770 is more efficient, averaging around 15-20 watts less when gaming.
Crossfire results are quite good as author said compared gainst more expensive 7950. much like the 5770 I owned, I had two and it was really good.