Regarding the compability with 2988 and 3988, the backplate fits both, so I'm guessing the waterblock will fit both aswell.
Also, I'm glad I didn't get ahead of myself and actually read the compability for the 980 hydrocopper on evga.com.
Thought the one there was for classified, but it's only for SC2, SC and ref model.
I have to chill the
(Deleted for Foul Language) down and be more thorough when checking for theese stuff! ^_^