The Guru of 3D posted a review on the Be Quiet! Dark Power 12 850W PSU
A quote from the article:
Shortly after the release of the PRO series 12 power supplies from be quiet! they now release the non-PRO mode, Dark Power 12. Initially released as 1000W, 850W, and 750W model we'll check out the first one. Now, don't let the looks and title fool you, this series is carrying a Titanium 80Plus certification also, and that means it is gaming the most efficient products they have available.Be Quiet! Dark Power 12 850W PSU Review