This usually happens on my fan #3 when i cold boot my system. I had this issue on my fan #3, which wasn't changing idle RPM even though my PCH temperature was already around 80. Fan is just completely ignoring the component's temperature. For instance, if CPU temperature hangs up on ~50C temperature, fans will still have ~800 RPM even if i stress my CPU (usually in this case RPM should increase up to 1500). Once more, it's not the monitoring tool related problem because fans aren't changing the speed if i load my CPU. Motherboard temperature sensors just stop working and hang up on the last value it was, even though RPM sensors still work. I've checked and can confirm that fans are really stopping, so it's not just monitor tool issue. I've tried different fan profiles (silent, standard, etc), different low speed, delays and nothing changed. This is so ridiculous i even made the video - where you can see the idle behavior (~400 rpm) and what happens when i load my CPU using 'stress' utility. When this problem happens, RPM decreases to 400-500 and the more i load my CPU the less RPM i get until fans completely stop. Usually fans should spin around 800-900 RPM when the system is in idle state. This is the most common issue i'm experiencing right now. Basically it works fine for some time (usually 2-10 hours), but then the expected behavior breaks in many different ways:ฤก. #1 and #2 case fans should change RPM depending on CPU temperature, and #3 depends on PCH temperature. I have 1 CPU fan and 3 PWM case fans (Noctua A14/A12). I did expect some problems when i was building this system (bleeding edge bios, etc), but i never thought there will be so much issues with such a basic functionality as temperature control. I'm using c6h wifi motherboard with 3700x CPU and currently experiencing a lot of problems with fan control / sensors on recent bios versions.
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