Is the CPU temperature reading correct on AMD Ryzen 5 1600AF CPU

[Darwin100]

Dear All,
I would like to say hello first and I am new to the OpnSense firewall. I am also a pfSense "migrant" finding the layout of the OpnSense firewall simply more intuitive despite the very close relationship between the two species of firewall.

To my issue: I have built a small firewall based around ASUS A320I-K ITX motherboard, AMD Ryzen 5 1600AF combination. It is running in a pink Silverstone SG13 case with 400W Silverstone ATX PSU and 16GB RAM plus 1TB Seagate 700RPM HDD with add-in 4 port RTL8111 NIC in the single PCIe slot, total of 5 network ports including onboard NIC.

I am monitoring the CPU temperature via OpnSense widget and observe CPU temperature range running around the high 70 degree range to mid 80 degree range and that seems high to me especially given the CPU usage reports typically around 0.10 whilst the OpnSense firewall is running.

I have listened to the CPU fan and it does not seem to run hard. I have booted into BIOS and when in BOS the CPU temperature reports around low 30 degree mark. I have booted into Windows and run CPU stress testing and never see the temperature get past mid 40 degree mark.

I have enabled PowerD in OpnSense web gui. I have set to use the AMD K8/K10 temperature monitor. I have tried HI Adaptive, Adaptive, Maximum, Minimum on all three of  AC power, Battery Power and Normal and none seem to have any specific impact on the reported CPU temperature.

I have used the various sysctl commands to check and confirm AMD power loaded and the CPU features detected for the specific AMD CPU installed. Thank you to all of the previous users who posted where I have learnt this from.

I have gone into the BIOS and switched from Auto calibrate for the fan control and changed to manual with accustom profile to speed up the fan. Whilst in the BIOS I have manually changed the minimum fan speed in the BIOS from 200RPM to 600 RPM. I have also observed the fan speed reporting around 1100RPM whilst CPU temperature is 32 degrees Celsius.

My questions; Is the CPU temperature being reported by OpnSense webgui accurate or not bearing in mind the reported temperature in Windows and BIOS observations?

Any suggestions based on insight and/or experience would be greatly appreciated.


Obiter: Where is the video card? It does not have one. I preinstall OpnSense with a video card in the single PCIe slot and when I have established management via the web gui I swap out the video card and install the 4 port RTL8111 NIC. It works a treat.

[Darwin100]

The OpnSense temperature reports a numerical value of 82 and says degrees celcius but when I check the ASUS BIOS the temperature is reported as 28 degrees Celcius.

I don't know if this is correct but my mate reckons that 28 degrees Celcius is about 82 degrees Fahrenheit.

He is suggesting the OpnSense GUI is actually reporting degrees Fahrenheit and not degrees Celcius. Does this sound correct? Or is the ASUS motherboard reporting the numerical value 82 and it is assumed it is Celcius?

[marjohn56]

Probably the latter, the temperature is pulled using an oid. If you issue the following commands from the shell you'll get back what FreeBSD is reporting.


sysctl -a | grep temperature


have a look at this page https://www.cyberciti.biz/faq/freebsd-determine-processor-cpu-temperature-command/