I purchased a 1080 EVGA hybrid cooler off Ebay to see if it would work well with the 1080 Ti. I was actually impressed and 100% satisfied at the results. This will be my setup until the next series of cards come out.
I paid $30 shipped for the used hybrid cooler.
With Furmark i was hitting around 80c with max fan speed on stock cooler. With the hybrid installed my max temp is 59c after an hour. This is with +200 core and +500 mem.
I have the stock Nvidia fan at 20% speed to still cool the VRM and the rest of the components that touch the stock plate.
Thanks goes to Gamers Nexus.
You do not need to disassemble the entire card. Just the top part of the shroud.
When all is said and done the only parts missing from the 1080 ti is plastic window and 4 screws that hold the window along with the heatsink.
I also removed the cap EVGA cap to the hybrid cooler.