Power Consumption Test
Using our PROVA Power Analyzer WM-01--or "Power Thingy" as it has quickly become known as to our readers--we are now able to find out what kind of power is being used by our test system and the associated video cards installed. Keep in mind that it tests the complete system (minus LCD monitor, which is plugged directly into AC wall socket).
There are a few important notes to remember, though. While our maximum power is taken in 3DMark06 at the same exact point, we have seen in particular tests the power being drawn as much as 10 percent more. We test at the exact same stage every time, so tests should be very consistent and accurate.
The other thing to remember is that our test system is bare minimum--only an SSD hard drive is used with a single CD ROM and minimal cooling fans.
So while the system might draw 400 watts in our test system, placing it into your own PC with a number of other items will result in a higher draw.
Power draw at a bit over 700-watts is high, as you'd expect. It's lower than the R9 290X 4GB CrossFire setup, though, thanks to the fact we're only dealing with a single card.
As we mentioned earlier, though, we do need a combined 50 Amp for the dual 8-Pin PCIe connectors. This means that not only do you want a power supply that is around the 900-watt mark at a minimum, but you want a quality one too.