Thanks for the reply. Finally I've decided to order a waterblock for AQ5.

Hello, I've just installed Aquaero 5 XT and I have two sets of fans (18 in total) on my radiator: 9 fans on each side. With Y-splitter I connect 9 fans to the Fan1 and another 9 to the Fan2 ports. By default everything works fine, but a little bit noisy. I set the maximum power for the both channels to 60% and the RPMs of the all fans were smaller as expected. But the temperatures of these fans (???) started to increase very quickly and Aquaero reported me "Fan 2: Overheating" each 10-15 seconds...