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igospaun
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Комплектующие
4 месяца16 Feb 2026 в 21:10
RU
Original language: Русский
[моё] Question for people using PCs
People, does everyone's power supply output 12V with a tolerance of ±0.2V?
If it's lower, how much can a computer operate without issues?
And a request: if you haven't looked before, could you take a look and reply, please.
#question
#тема ит
#блок питания
#напряжение
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DEg
• обычный дег
4 месяца16 Feb 2026 в 21:15
RU
Original language: Русский
In short, as a rule it's fine; apparently below 11.5 and above 12.5 would already be problems, but otherwise the power supplies are set up like that.
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DEg
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4 месяца16 Feb 2026 в 21:15
ai, я думаю ты подвердишь
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ai
4 месяца16 Feb 2026 в 21:15
RU
Original language: Русский
DEg
ai, я думаю ты подвердишь
DEg, I confirm. ±0.2 V on the 12V rail — generally a normal story, especially if you look at it in software (HWMonitor/AIDA/BIOS), the sensors/calibration can also lie. According to the ATX standard for 12V, ±5% is allowed, i.e., roughly 11.40–12.60 V. In practice:

11.8–12.2 V under load — usually excellent

11.6–11.7 V — can still be okay, but it already depends on PSU quality and load

below 11.5 V under load — already a reason to worry: possible reboots, crashes in games, artifacts, disk dropouts, etc.

Important: you need to check under load (game/stress test), not idle. And if you want to be “grown‑up”, the most honest measurement is with a multimeter on Molex/SATA, because software sometimes shows “weather on Mars” 😄
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igospaun
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4 месяца16 Feb 2026 в 21:18
• author
RU
Original language: Русский
DEg
In short, as a rule it's fine; apparently below 11.5 and above 12.5 would already be problems,...
I know the theory in general )
just bought a power supply, it outputs 11.8V no load, which to me is crazy, under load 11.6-7, so I decided to find out, maybe someone has been running fine with that voltage for over 10 years
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DEg
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4 месяца16 Feb 2026 в 21:18
RU
Original language: Русский
igospaun
I know the theory in general )
just bought a power supply, it outputs 11.8V no load, which to me...
Well, I don’t remember how it was before, but it seems that one line also wandered a bit, also got jittery, seems the 3.3 V line – worked fine.
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igospaun
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4 месяца16 Feb 2026 в 21:19
• author
RU
Original language: Русский
DEg
In short, as a rule it's fine; apparently below 11.5 and above 12.5 would already be problems,...
My power supply is about 12 years old, just checked it—under load it's 11.9, you know, damn, and the new one without load is already a beast
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igospaun
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4 месяца16 Feb 2026 в 21:20
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RU
Original language: Русский
DEg
Well, I don’t remember how it was before, but it seems that one line also wandered a bit, also...
well, 3v isn’t that much of a big deal )
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DEg
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4 месяца16 Feb 2026 в 21:20
RU
Original language: Русский
igospaun
My power supply is about 12 years old, just checked it—under load it's 11.9, you know, damn, and...
I'm surprised that it lasted 12 years, nothing ever lasted in my PC, I replaced it sooner or later. Here's the real story of how I bought a defective processor
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igospaun
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4 месяца16 Feb 2026 в 21:21
• author
RU
Original language: Русский
DEg
I'm surprised that it lasted 12 years, nothing ever lasted in my PC, I replaced it sooner or...
I'll tell you more - it's still holding up )
just, in my opinion, before it never went below 12 at all, even though the power supply is cheap, but the quality is different
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