Reliable voltage/temperature monitoring

[explicitlyrics]

With me upgrading my computer I thought I would investigate the voltages/temps in my old computer. Speedfan is showing 43 degrees for my CPU which seems reasonable. However, it is showing two other temperatures (127 degrees and 61 degrees) which are worryingly high and quite confusing. It is also showing voltages that are very different from what they should be:

1.66V - +3.3V rail
2.85V - +5V rail
9.01V - +12V rail
2.91V - -5V rail

I have no idea if they are actually correct since I did just put a cheap power supply in it? In which case that PSU needs to go back as it was only bought today (good PSU has gone in new PC).

I know Coretemp is best for the CPU temperature (but it doesnt run on this PC since it isnt a rev F/G AMD CPU). I have no idea what program is good for voltage measuring?

Thanks

[mr mister]

TAT is good for temps, Not sure on a good prog for measuring voltages really, a multimeter is going to be the most accurate. I can say for sure that speedfan is no good for psu rails (mine are all stupid values like yours).

Also the 127C temp is speedfan is likely to be where a temp probe is not connected so that can be ignored. With the other one check to see if it changes at all between load and idle - if it doesnt it generally isnt worth worrying too much about.

[Agent]

I have no idea if they are actually correct since I did just put a cheap power supply in it?

They aint. Your PC wouldnt be working with voltages like that

A multimeter is the only real way to get accurate voltage readings.

[explicitlyrics]

With a voltmeter my readings come out far more normal.

+5V - +5.03V
+12V - +12.29V
+3.3V - +3.450V
-5V - -5.13V
+5VSB - +4.89V

Thanks for the information about the disconnected probe. It would make sense as I have been unable to make the 61/127degree values change in testing.