Thanks for the response! I've set that option to "ignore" for my CPU fan as well. I was more concerned with Fan XPert 2 controlling the speeds of chassis fans. However, after some investigation and experimentation, I realized that the pump fan header cable only has one wire and in fact is not controllable at all. The single wire is simply to report the RPM to the mobo. So Fan XPert is not trying to control it and I have nothing to worry about.