Not knowing what motherboard you have, my personal preference is connect the rad fans to the CPU and CPU_OPT fan headers and control the speed using the CPU temperature in the bios, there is several auto settings in ASUS bios, Auto, Turbo, Standard, or manual where you can set percentages of max fan speed to temperature settings which I find the best whiteout relying on software. You may still need to install the software to control the lighting on the water block, there are several aftermarket monitoring Apps that can monitor temperatures, voltages and fan speeds in real time, or AiSuite can do the same