What is CPU OPT (CPU_OPT)?ĬPU_OPT, standing for “CPU Optional”, is mainly used when you have more than one fan on your cooler/radiator, and you need someplace to plug it in.Įssentially it’s CPU_FAN without the “not booting if nothing is connected to it” part. You must make sure to plug your CPU cooler fan into this header, as most motherboards worth their name would not allow you to boot your system otherwise.Īlso, if the system is already running somehow, a misread of this CPU FAN header will safely shut your system down if it detects that the CPU has no cooler or that the fans are defective and/or not spinning (when they are supposed to).
Here's a listing of my fans in their current states: $ sudo ipmiutil sensor | grep FANĠ01a SDR Full 01 01 20 a 04 snum 60 FAN1 = 00 Init 0.00 RPMĠ01b SDR Full 01 01 20 a 04 snum 61 FAN2 = 05 OK 500.00 RPMĠ01c SDR Full 01 01 20 a 04 snum 62 FAN3 = 05 OK 500.00 RPMĠ01d SDR Full 01 01 20 a 04 snum 63 FAN4_1 = 00 Init 0.00 RPMĠ01e SDR Full 01 01 20 a 04 snum 66 FAN4_2 = 00 Init 0.00 RPMĠ01f SDR Full 01 01 20 a 04 snum 64 FAN5_1 = 00 Init 0.00 RPMĠ020 SDR Full 01 01 20 a 04 snum 67 FAN5_2 = 00 Init 0.00 RPMĠ021 SDR Full 01 01 20 a 04 snum 65 FAN6_1 = 00 Init 0.00 RPMĠ022 SDR Full 01 01 20 a 04 snum 68 FAN6_2 = 00 Init 0.00 RPMįAN2 and FAN3 are physically connected to fans on the motherboard, and the fans are turning.Which one do you choose? CPU_FAN or CPU_OPT? What is CPU FAN (CPU_FAN)?ĬPU_FAN, standing for “CPU Fan”, is the main header used by the motherboard, the BIOS, or any fan-software (SpeedFan, HWMonitor, NZXT CAM, etc), to influence the CPU’s thermals by controlling the fan speed. Setting sensor "FAN3" Upper Non-Recoverable threshold to 400.000
Setting sensor "FAN3" Upper Critical threshold to 400.000 Setting sensor "FAN3" Upper Non-Critical threshold to 400.000Įrror setting threshold: Command illegal for specified sensor or record type Here is what happens when I try an "obvious" command to put an upper bound on fan speed of 400RPM: $ sudo ipmitool sensor thresh "FAN3" upper 400 400 400 So I tried the cli, which I prefer anyway.
I can log on but it's not particularly easy to use and no matter what settings I change, they seem to revert back. I have an X570D4U-2L2T motherboard with a Ryzen 5600x and am running Ubuntu 21.04.Ĭan the community advise how I might use ipmitool or ipmiutil to control the fan speeds – either to set a constant value or to set a curve? Background information
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