I also had this issue and it was driving me nuts for a very long time. All the fans in the case, including the radiator fans where revving up and down even with the slightest activity, like browsing the web. I have the H110i GT and i thought that the problem was caused by Corsair Link being buggy, but it wasn't. Firstly, the radiator fans where configured to respond to the 'CPU package' instead of the 'H110i GT temp', being the temp of the liquid in the radiator. I changed it to the latter and the problem was solved partially. The case fans continued to rev up and down and i could not find the solution until now. In the BIOS/UEFI, the chassis fans where also set to respond according to the CPU temp/activity. I changed it from 'CPU' to 'motherboard' and the problem was solved. Finally, it is quiet now as it should be.