For testing power consumption, we took our test system and plugged it
into a Kill-A-Watt power meter. For idle numbers, we allowed the system
to idle on the desktop for 15 minutes and took the reading. For load
numbers we measured the peak wattage used by the system while running
the OpenGL benchmark FurMark 1.9.2 at 640×480 resolution. We also ran the game HAWX 2 and looped the benchmark three times and recorded the highest Wattage seen on the meter.
Power Consumption Results: The AMD Radeon HD 7770 is a very energy efficient video card that has a typical board power of just 80 Watts in normal usage scenarios. The Gigabyte Radeon HD 7770 OC is factory overclocked and uses a larger 10cm cooling fan, so it will be interesting to see where this card falls. Our power meter showed our test system at 91 Watts when at an idle on the desktop with all of the Radeon HD 7770 cards. At full load with Furmark the Gigabyte Radeon HD 7770 OC used roughly the same amount of power as the XFX and AMD versions of this card, which is great considering the raised clock speeds.
|Maximum Board Power||Typical Board Power||Long Idle Power|
|Radeon HD 7970||250W||~230W||<3W|
|Radeon HD 7950||200W||~180W||<3W|
|Radeon HD 7770||100W||~80W||<3W|
|Radeon HD 7750||75W||~55W||<3W|