Actually when I had the GTX1080 Armor (watercooled at 2164/2190 core), I saw 5% performance drop on the September 2016 drivers and another 3% on the March 2017 drivers.
That is why even today my scores in the benchmarks in this forum for the GTX1080 aren't beaten two years later. Only the TimeSpy lost the lead but due to the fact someone used the 11Gbps VRAM version.
@JediFragger because things are relevant, go to the FS Standard and look at my Vega 64 graphics score with 18.8.1 and compare it even with Kaap's 1850 clocked Vega 64.
And since you are there, look at the higher GTX1080, which last time I checked was still mine.