I think the 1200 efficiency is about the same as its little brother, but it lest it will not shut down at 1.6Vcore which prompted me to get the 1200.
I saw more than 400W on the power meter here and that with just an HD2600 XT whom requires rough 20-30W without load. I used >1.5V that time.
That's why I use the Zalman 850W now.
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