1080Ti does >20 now at 100% TDP, if I go the lock @ lower voltage and higher speed way I'll pull even more. And that with -i 20.
Most of my 1070Tis do well over 13, and I' haven't pushed them to their limits. Not sure this is worth it.
Most speedup on the 1060 cards. on the 1080ti I see a 1 MHASH improvent. If I run with 70% tdp,
alexis 1.0 18,5, and mine 19.5. (same clocks)
Need some more work.