Err, the 1080ti will be louder than the 1080, as it will be almost +100W, more when overclocked. Of course that's assuming the same cooling method.
1080's are already very quiet cards, unless you bought a flounders edition, in which case you have no-one to blame but yourself.
i did get a Founders edition. Like i have for last 2 gens. However Its better for SLI scenarios.
I was not going to wait 5 odd months for the classified i ordered... (was running on a 430)
That does not mean its my Fault..
could i got another card? yes.
still i can sell this 1080 Right now & get a Ti with no issues.