Before we bring this article to a close, we'd like to cover a few final data points. Throughout all of our benchmarking and testing, we monitored how much power our test systems were consuming using a power meter. Our goal was to give you all an idea as to how much power each configuration used while idling and under a heavy workload. Please keep in mind that we were testing total system power consumption at the outlet here, not just the power being drawn by the motherboards alone.
With a new northbridge manufactured using a more advanced 65nm process and an updated southbridge stripped of some legacy features, we expected the P45 chipset to require less power than the X48. And we were right. While idling, the P45-based P5 Deluxe consumed 11 - 13 fewer watts than the X48 boards. And under load that delta increased to 12 - 15 watts. Considering its relatively low power consumption and the low operating temperatures we witnessed, we'd say the P45 is going to be well suited to quiet / silent computing applications.