Thats nice!  I know my 1080TI can hit upwards of 800Sol around 1850-1900Mhz (it moves around) at 90% TDP if the temp is sub 50C.  Yeah my efficiency rides around 3.3-3.4 with the card on average.  Still good in my book.  Way better than when i started at only 680 Sols @ 100% TDP  It ends up being more efficient than my 1060's I got but least I topped out what my 2 small rigs can handle for cards and temp.  

Maybe I should look back into water cooling again.  Use to do it ages ago(14+ years), maybe its time to investigate it again.
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How do you get 800+ @1900MHz, what card and what OC settings, can you share?

I am able to hit 790-805 @2015Mhz (270W)