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Which cpu is more energy efficient?

So i got a few leftoverparts after an upgrade,and the spare part will become a kids web browsing machine.
I want to save some electricity which is more energy efficient?
I3 540 with motherboard in the gateway SX2850
I3 2120 with biostar h61mgv
Thanks in advance.
3 answers Last reply Best Answer
More about energy efficient
  1. Best answer
    The 2120 is lower max power, lower idle power and more performance.
  2. Best answer selected by Giggitygoebbels.
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