Power Consumption and Heat
We have a few final data points to cover before bringing this article to a close. Throughout all of our benchmarking, we monitored how much power our nForce 680i SLI based test system was consuming using a power meter. Our goal was to give you all an idea as to how much power each configuration used while idle and under a CPU load. Please keep in mind that we were testing total system power consumption here, not just the power being drawn by the motherboards and processors alone.
The nForce 680i SLI motherboard consumed marginally more power than any of the other systems while idling, but surprisingly it consumed a bit less power than the nForce 590 SLI Intel Edition under load. The 975X Express-based system consumed considerably less power at idle and under load, but there are some things to take into remember looking at these numbers. The nForce 680i SLI has more than double the amount of PCI Express lanes than the 975X Express, and the EVGA nForce 680i SLI motherboard we used for testing has a host of integrated peripherals that all consume some level of power.