Hello,
Can you help me?I want to install custom cooling on my 1080ti SC2 specifically Arctic Accelero Xtreme IV because i saw good results in the reviews. Is this cooling fit on that model?

Is it worth buying?

No i did not buy it because I don't knkw is it worth it.

If you're looking for better cooling than stock, the ARCTIC Xtreme IV should fit as it is listed as compatible with the 1080 Ti.

Also, if your options are still open and looking for better cooling without taking the deep dive into custom cooling, I think going with a hybrid kit would be worth it, that's if you're willing to spend the extra funds for it.  NZXT has the GPU bracket and you can pretty much use it with most AIOs out there whether it be 120mm or 240mm if your budget permits.  Just make sure any other 3rd party AIO is compatible if you head that route.

MyKnock
I am looking for better temps and less noise. My card ia running around 80c sometimes reach the 90c limit. The watter cooling is expensive for me. I use Fractal Desing Meshify C with 2 x 140 in and 1x 120 at the back, 2 x 140 top out.

Ok so no go with hybrid.  The Xtreme should do your justice but before you go that route, how are your fans setup throughout the whole system as those GPU temps seem really high.  Are there any OC's to the GPU?

Could be the blade touching something or turbulent air created because the blade is almost next to something like a wire or w/e.  I'd inspect it to see as some have complained about either a wire in the way or what not.