Or, you may want to look at a test system with a GTX580. Taken from guru3D (
http://www.guru3d.com/article/geforc...580-review/7):
Quote:
GeForce GTX 580 review
By: Hilbert Hagedoorn Edited by Ian R Barling | Published: November 9, 2010 Power consumption
Let's have a look at how much power draw we measure with this graphics card installed.
The methodology: We have a device constantly monitoring the power draw from the PC. We simply stress the GPU, not the processor. The before and after wattage will tell us roughly how much power a graphics card is consuming under load.
Our test system is based on a power hungry Core i7 965 / X58 system. This setup is overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). On average we are using roughly 50 to 100 Watts more than a standard PC due to higher CPU clock settings, water-cooling, additional cold cathode lights etc.
Keep that in mind. Our normal system power consumption is higher than your average system.
Measured power consumption
System in IDLE = 187W
System Wattage with GPU in FULL Stress = 447W
Difference (GPU load) = 260W
Add average IDLE wattage ~ 20W
Subjective obtained GPU power consumption = ~ 280 Watts
Mind you that the system wattage is measured from the wall socket and is for the entire PC. Below, a chart of measured Wattages per card. Overall this is much higher than reference, this is due to an increased GPU voltage to allow easy overclocking and the standard higher clock frequencies.
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Again,
440 W, full stress, increased GPU voltage, power hungry i7 965/x58 ...
Also:
Quote:
Here is Guru3D's power supply recommendation:
GeForce GTX 580
On your average system the card requires you to have a 650 Watt power supply unit.
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So you're right, maybe, I'm a little bit short (but games don't stress the PSU as the FurMark tests), but my advice to keep the 600W PSU was perfectly legitimate. Or at least, guru3d and I are wrong, and you are right.
Cheers!