Im looking at this water block, I check the website and it didn't mention anywhere that it compatible with the 980ti, just want to make sure before I order something I can't use.
No. A reference 780Ti will fit the reference 780, Titan and Titan Black. A reference 980 will also fit some 970's based on the same PCB, not all. A reference Titan X block will fit a reference 980Ti, the Titan X was released first so most are named after that.