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What is an acceptable variance on 12V rail?

post #1 of 4
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My psu is showing 11.88 V in the bios. It's a new psu.
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post #2 of 4
should be ok, it usually 12v -/+ 10%

should go back to 12/+ when under load.
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post #3 of 4
11.88V is fine, although you shouldn't trust software-based monitoring. There isn't really cause for worry unless you experience system instability. And then if you wanted to check your voltages, you ought to use a digital multimeter.
Unlike what the above poster said, the allowed variance (as per the ATX specification) is +/- 5% (11.4-12.6), and should preferably stay within 3% (11.64-12.36).
post #4 of 4
Quote:
Originally Posted by ASSEMbler View Post
My psu is showing 11.88 V in the bios. It's a new psu.
ATX Specs let 12v, 5v, 5VSB, & 3.3v rails stay between +/-5% of their nominal value.
-12v rail is +/- 10%

Don't trust your BIOS, it cannot accurately read voltage from the PSU.
Invest in a Digital Multi Meter if you're looking to do voltage readings.

Return your PSU; it is a bad unit that cannot put out more than 450w without going outside of ATX Spec in ripple.
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