FINALLY building my system after several months, WOOT! for Coffee Lake, and have a question on motherboard pump headers. My Gigabyte Z370 has two different pump headers. The one nearest the CPU is a "High Power" 3 Amp pump header. The other one, that runs at the standard power, is way down at the bottom of the board. As I will be running my rad in push/pull, the CPU and CPU_OPT headers are occupied by fans. Since I will be manually controlling the pump speed, is using that "High Power" 3 Amp pump header safe?

I've checked the manual for my board, and the speed, and therefore the power since it's PWM, can be adjusted. But from my understanding of PWM you do that by setting a power percentage. Which for this header would be 3 Amps at 100%. Which, if I'm understanding this all correctly, would cause the pump to run faster than if it was connected to a regular PWM header that delivers less power. So, if I want to run my pump at 90% for better noise, would this more powerful header actually be causing my CLC 280 pump to run too quickly?

Sajin
The 3 amp header is rated at 3 amps. Which means it can support/supply up to 3 amps safely. Running the clc at 100% pump speed via the 3 amp header isn't going to force the pump to run at 3 amps. The 3 amp header will only supply what is needed to run the clc at 100% pump speed. Running 4 1 amp fans at full speed off the 3 amp header would cause the 3 amp header to burnout as it's only rated at 3 amps.

Ah, that makes sense, thanks. It can deliver the higher amperage, if needed, but only supplies the power required. Awesome.