Opinions on Speed fan to montior temps and stuff in PC?

I do not attempt to change any default settings, which I think speedfan does... so for just information I think cupid hwmonitor does more

HWMonitor, Speedfan and RealTemp all basically do the same thing: they monitor temps, voltages and speeds in 'real-time'. They do not change any system settings. There are some differences in layout and options, but essentially there is no difference between them.

>do not change any system settings

I no longer use it since I prefer the HWMonitor information screen, but I have SpeedFan 4.40 installed (reminder to self... uninstall SF)

When I click the CLOCK tab at the top, the following message pops up

This is an advanced feature.

By setting the wrong motherboard or the wrong clock, you might hurt your system.
Use it at your own risk and only if you really know what you are doing :-)

I have never DONE anything on that screen, but that "looks" to me as if SpeedFan will, in fact, allow you to change settings

But, since I have never tried to change anything... that could be a wrong reading of the message