Arctic cool, pretty much sums it up. -30 C difference from the stock cooler!
I was running an Asus 1070 Ti, with the factory "blower" style fan, and it was getting close to 80 degrees C, with a moderate overclock, and gaming at max settings at 4k resolution. The factory blower fan was super loud when gaming. I installed this Arctic Accelero Xtreme IV cooler, and now I'm seeing max 50 degrees C, under the same overclock and gaming conditions. The installation is a bit time consuming, but if you are good at that type of thing, it's relatively easy. I will say that the cooler itself is fairly large, so make sure it'll fit both length and width where you want it to go inside your computer, before you start taking everything apart.
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