TechPowerUp takes a look at the Gigabyte UD850GM 850 W
A quote from the article:
The Gigabyte UD850GM is a decent choice at around $110. It lacks a bit in overall performance, but has fully working protection features, compact dimensions, and won't force you to wear earplugs as long as it isn't pushed hard. I expect an upgraded version with a 12VHPWR connector for future GPUs soon.Gigabyte UD850GM 850 W Review