I recently got an ASUS Strix z270g and installed a H100iGTX I already had , I have the pump power cable connected to the pump header in the board and the USB in the cooler connected to a USB2 header, I noticed the following:
When the 2 fans that I have on the radiator are connected to the water pump fan cables I could see the pump RPM but not he Fans rpms in AI Suite 3.
When I connected the 2 fans to the CPU_FAN and CPU_OPT headers the pump RPM disappeared from AI Suite but I could still see it in Corsair Link 4
It's a bit annoying since it seemed to me that when I had the first setup AI suite would manage the pump rpms based on the CPU temp. but now that I have the second setup it seems to ramp up and down fans but not he pump when I stress test.
AI suite seems to to a better job at managing fan and pump speeds than CL4, but I cannot get it to control pump and fans at the same time. I don't want to have the pump working at higher RPMs than needed but seems the safer choice to keep the temps down since the pump RPMs pretty much stay fixed.
I've have begun to wonder if I should get another closed loop cooler that works better with the ASUS motherboard and AI Suite.