TechPowerUp posted a review on the Gigabyte GTX 1080 G1 Gaming 8 GB
A quote from the article:
The Gigabyte GTX 1080 G1 Gaming comes at $649, which is $50 cheaper than NVIDIA Founders Edition pricing. The card is overclocked out of the box and its heatsink works much better than the one on the FE. It features idle-fan off, runs cooler, without throttling and is still quieter in gaming.Gigabyte GTX 1080 G1 Gaming 8 GB @ techPowerUp