My 3080Ti would sit at 84C stock on sessions though I always open the power slider, even most reviews in open test beds had them doing 75C, so wouldn't surprise me in a closed case being higher, though when I took mine apart to put on water I have to say the FE build was not impressive and I don't think the best contact was made.
The FEs do seem to be setup not to make a lot of noise though and used the temp margin to keep clocks up and fans low they hardly ramped at all, lots of scope for improvement with an adjusted fan curve, better under water though.
84 would not make me comfortable. Someone else was having similar temps here with an NZXT and managed to get it down 10 degrees