Yeah, modern quiet 120mm fans aren't likely to draw enough to burn out a header if you don't put a lot of fans on one header, but I'd still do the math to be sure. The problem was a lot more common in ...
It's recently occurred that I need to drive more fans than my motherboard has fan headers. These are four-pin PWM fans and the motherboard headers are also four-pin. As I understand it, the pins are ...