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Hardware Secrets posted a review on the Seasonic X-Series KM3 650 W Power Supply



Seasonic is releasing the third generation of their power supplies with the 80 Plus Gold certification, dubbed the X-Series KM3, using a completely different internal design. So far, three versions were released, 650 W, 750 W, and 850 W, all with a single +12 V rail and a fully modular cabling system. Let’s see how the 650 W model fared on our tests.
  Seasonic X-Series KM3 650 W Power Supply Review