Looks like he set the card for about 60% of default TDP (150 watts or so) - which is in the most efficient ballpark range for all the Pascal cards I've worked with.

 5.23 5.10 5.09 on his first 3 readings - I'd call that 5.16 as an average, which is definitely but not hugely better than my 1070 ti cards at their near optimal 60% TDP setting that achieve 4.4+ or the 4.2ish ballpark a 1080 ti can manage at that same power setting.

 Looks like my "20% better efficiency" ballpark guess was pretty bloody close, though I don't know of BBT put the time into optimizing the other settings.

 I wonder if there is going to be a 1170 ti variant?