Question: I have hero vii and h100i gtx on it and i found these 2 water_pump in the board. Is it ok to use this as the power supply for the 2 120mm fans?
Yes you can connect any 4 pin or 3 pin FAN header to this 2 water_pump (FAN) headers. But i think the fan speed of this 2 water_pump (FAN) headers will be controled by the CPU temperature. Check your BIOS to see which settings you can do to this 2 water_pump (FAN) headers.