I watched AdoredTV Video comparing the 980Ti with the 1080, the 980Ti as everyone knew it's dramatically faster than a GTX 1080 clock for clock (just to clarify the graphs from AdoredTV already had the core difference offseted).
While the 1080 was running at 95 FPS the 980Ti was running at 107 FPS which is a 13% difference in clock for clock performance, now from 1400MHz to 1800MHz (which isn't 100% 1800MHz and could be averaged down if we had more data, probably to 1700MHz or so because Founders Throttlition) there's a 21% difference - 13% = 8%
The 980Ti at 1400MHz should be 8% behind a GTX 1080 at a FIXED 1700MHz.
In any way, these benchmarks seem a little bit off, I trust Computerbase the most because they always go the extra mile with their testing.
Edited by Dargonplay - 7/30/16 at 2:31pm