How to check the CPU temperature in real time without using any software!

Hello everyone! What a discussion we have here! So, I checked my setup. I have one fan on the motherboard. The sound is quiet, typical for a fan. The second, smaller one, is on the case and works as an intake fan; it's inaudible. The power supply makes the most noise. They suggested getting an FSP. I'll look into it. :) I turned on the computer with the side panel removed. At startup, the temperature on the CPU was 30 and 42 degrees Celsius. After 25 minutes, it reached the previously mentioned values (which I recorded during a reboot). The conclusion is that, on my specific machine, removing the side panel of the case does not affect the CPU and system temperature. Thank you all for participating!