The Kraken X61 doesn't work well with the Gigabyte GeForce GTX 980 Ti Xtreme gaming in the NZXT's case. I believe that I will have to upgrade the cooling fans or replace the GPU by a water cooled one.
The case is beautiful. I don't mind having an ITX PC case larger than the usual.
The GPU is huge and the gap between its fans and the case is too narrow. one of the fans rubs the case if you don't put a spacer.