Overclockers Club published a review on the NVIDIA GeForce GTX 1080 Overclocking
A quote from the article:
The best combination of results that I was able to run all of the game tests with came in at a GPU Boost 3.0 clock speed of 2050MHz on the Pascal core. In some game tests 2076MHz to 2088MHz was perfectly stable, but not in all games. This gives the end user about an extra 315MHz of headroom to play with that does indeed drive the performance to another level. Micron's GDDR5X memory also plays well when you start clocking it up. I was able to push the 8GB of GDDR5X memory to a data rate of 11Gbps. This final step again helps with memory bandwidth to get you that last bit of performance out of the GTX 1080. Having good architecture and a great power delivery system help improve performance across the board by allowing stable overclocking at high levels.NVIDIA GeForce GTX 1080 Overclocking Review @ OCC