Power Consumption

Power Consumption

Here's where we'll slowly move into physically testing the processors and respective chipsets. Ivy Bridge based processors are a bit of a redesign alright with the die-shrink, and as a result they quite energy friendly processors with a 77W (for the enthusiast models) TDP. What you'll notice a lot is that in idle these things kick ass in matters of power consumption, whereas at peak TDP they behave quite normally.

In an IDLE state the PC (Z77 / 3570K / 8GB memory / GeForce GTX 580 / SSD) consumes roughly 85 Watts. Bear in mind that we measure the ENTIRE PC, not just the processor's power consumption. When we place load on the CPU and we see the power draw rise, the system now consumes roughly 160 Watts. This is with merely an SSD, memory and the GTX580 installed. Your average PC will draw a little more power if you add optical drives, HDDs, soundcards etc.

Now more intresting is to remove the graphics card and to see how it behaves then. As shown in the chart above the embedded IGP is used only, then power consumption is greaty. In IDLE we measured ~50 Watts and with processor load 112 Watts for the entire PC.

I want to make it very clear that power consumption measurements will differ per PC and setup. Your attached components use power but your motherboard can also have additional ICs installed like an audio controller, LUCID chips, network controllers, extra SATA controllers, extra USB controllers, and so on. These parts all consume power, so this is an indication.

Next to that, we stress all CPU cores 100% and thus show a PEAK power consumption. Unless you transcode video with the right software your overall/average power consumption will be much lower.

Really nice tempartures, but we are using a liquid cooling kit from NZXT, the Kraken 40.