Do we really need vari-speed fans or controllers?
I don't think so..................just one more thing to go wrong.

One point I didn't make is that the MoBo manufacturer may have put in sensors for the temperatures and fan speeds, but they need to add circuitry for software to control the fan speeds.....................most don't.

I will only rely on software supplied by the MoBo/computer manufacturer, and I test that with a laser guided spot thermometer.

If the thing runs hot, add more fans and tidy up the cabling so you have decent air-flow.