How does the supply voltage affect the operation of the system?

Question

Electronics

Good day, ladies and gentlemen!

I recently updated the power supply on the computer, because the old one had been plowed for a good 10 years and could go to another world any day, and even take the system with me to boot.

And so I decided to check the voltage readings on the power lines.



I don't know much about it myself, only superficially. Like, at the output voltages there should be a deviation of no more than 5%. And as you can see, I have serious deviations at 5 volts and 12 volts, but at the same time, the system works stably. And the main questions are as follows - how does this affect the operation of the system and is it normal?

I would be grateful if someone could help me understand the situation.

PS Do not judge strictly for ignorance - I came for knowledge :)

Answer 1

The voltage meter built into the motherboard can work with an error of up to 20% - it is unlikely that it is somehow calibrated.
Particularly pleasing are the only 8V measured on the 12V line, which is clearly not enough for the system to work.

Answer 2

Well, 5v is OK
12v is a strange indicator,
but in general it seems to me that this should not be measured by software, but by a tester directly from the PSU

Answer 3

if the voltages are within operating limits, then they should not affect.
for + 12v a strange value and a strange operating range.
but you need to look at the parameters of the power supply and monitoring programs, etc.
maybe just a piece of iron gives out a value, not "12v" but "8v" and the program interface did not convert the values.

Answer 4

Check Start → Control Panel → Power Options → Advanced Settings → Processor Power → Minimum Power.
By default, the processor power can range from 5% to 100% depending on the current load, i.e. read "voltage on the board", because. the current and resistance for the processor are constant.

Answer 5

Many thanks to everyone!
The problem was in the software. I always considered OSST to be a reliable program, but then it failed, as it turned out.
AIDA64 gave stable voltage readings.

+ I went into the BIOS, there are the same stable values.
Once again - thank you all!