Intel Core i7-4770K Review: Haswell Has Landed
Total System Power Consumption
Throughout all of our benchmarking and testing, we also monitored how much power our test systems consumed using a power meter. Our goal was to give you all an idea as to how much power each configuration used while idling and while 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 processors alone.
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Power consumption with the Haswell-based Core i7-4770K is excellent. When using the processor's integrated graphics, our test system consumed only 37 watts at idle and 104 watts under load. That's the lowest idle power we've seen to date, and only 2W more than the 3770K, which doesn't perform as well as the new 4770K. With a discrete GPU installed, however, the Core i7-4770K-based system consumed a bit more power than its Ivy Bridge-based counterpart, the Core i7-3770K, which was somewhat surprising. We believe the deltas have more to do with the different motherboards that has to be used for testing though, rather than the processors themselves.
Also note that the third-party motherboards from MSI, Gigabyte, and ASUS all consumed more power than Intel's offering. The differences were small, however. The feature laden Asus Z87-Deluxe consumed the most power of the Z87 Express-based boards we tested, but it also had on-board WiFi and other features not present on the MSI and Gigabyte boards.
