So Computerbase finally tested the first custom 1080. The Strix OC from ASUS goes up to 2000MHz.
http://www.computerbase.de/2016-05/asus-geforce-gtx-1080-strix-oc-test/3/#abschnitt_benchmarks_in_ultra_hd
And it's still just 22% above an overclocked 980ti. People who are switching from that are crazy.
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