With a h100i watercooler the i7-4790K at 4.4Ghz 100% load in Aida64, Prime95 and IntelBurn you should get no more heat than 63 to 65 Degrees max. At idle depending on outside temps you should get around 25 to 27 Degrees.
The H100i is a good AIO unit but there are better units out there i.e bigger rad's etc.
How the H100i looks in action