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    There is no telling which one is quieter. For all we know the 1200 Watt PSU has two fans and the second one only kick in under high load. (The first fan could be identical to the fan in the 600 W version). -- TL;dr. There is not one single clear answer.
    – Hennes
    Commented Mar 28, 2013 at 15:54
  • Yes, but my theory is that manufacturers has logic that sets RPM at a certain load level, so 1200W at 33% would be spinning slower than the 600W at 66% load, and usually slower RPM will result in less noise. Though I don't know if this theory is true in practice.
    – KoKo
    Commented Mar 28, 2013 at 15:57
  • It could well be true for many, or even most PSU's. But there is no sane way to compare any 600W PSU with any 1200 Watt PSU and make a safe prediction. You will have to compare specific models.
    – Hennes
    Commented Mar 28, 2013 at 16:03