Asus z97-A CPU opt fan

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Guest

Guest
So I just noticed in my bios that the rpm for my extra CPU fan (on a cm hyper 212 evo) is highlighted red, because it's running consistentley lower than the main CPU fan.

I don't know why this is, all other fans are running fine, and I can't actually adjust the speed in the manual fan tuning because CPU opt fan doesn't show up.

Not sure what to do here, please assist

P.S. I know an extra fan on a hyper 212 evo is pretty unnecessary but I wanted those extra 2 degrees gone