How Much Power Does an iMac Use?

When powered off the 22″ dual core i5 iMac still uses 1.1 watts every other secondiMac Power. At startup you use 110 watts. About 40 watts sleeping & 80 just chilling with some windows open. A lot of the power is used to keep the 22″ screen nice and bright but the majority of the power is spent on processing.

iMac’s like most all desktops, are not terribly efficient. Tablets and laptops are to smartcars as desktops are to powerful SUV’s. You pay for that power at the pump (or outlet) whether or not you’re using it. It comes in handy when you are hauling a boat or rendering a video.

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