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My "wierd" 12v readings

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January 29, 2009 12:23:35 AM

hi guys!
i've just noticed i have been getting a really retarded 12v reading. its currently showing 11.6v and fluctuates. i used everest and did a stability test and had a look at the stats. my max was around 11.7v and min 11.4v while averaging around 11.5 - 11.6v.

will it cause problems later on? cos my system is quite stable atm

More about : wierd 12v readings

a b ) Power supply
January 29, 2009 12:57:13 AM

It's just a bit low, but well within the ATX specs of ±10% (11.8V - 13.2V). Don't worry about it if the system is stable.
January 29, 2009 2:02:15 PM

Mine drops to 11.14.
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a c 144 ) Power supply
January 29, 2009 5:34:14 PM

That's a bit low, but the voltage should be a little more stable.
January 29, 2009 8:38:18 PM

That could be attributed to one of two things or both......

1. The power coming in to the Power supply is not the pristine 120V / 60 cycles that it is designed to work well at.. (A tolerance of +- !) % is usually allowed by government

2. The power supply is not working as it should (or it is junk)

or

Both.... you can check everything with a DVOM... I always do ... I do not always trust software to check hardware. Especially in this case....
January 31, 2009 2:52:51 AM

thanx for replies. i was gonna change my psu to resolve problem but instead i changed my Gigabyte GA-8I945P Pro and P4 515(J), to a new xfx 680i lt and an e8400. my whole system is still the same.

i ran the everest stability test again and my readings for the 12v are now - min 11.99, max 12.01, avg 12.

now i didnt expect this to occur... maybe the mobo quality or the cpu is using less watts.
a b ) Power supply
January 31, 2009 2:37:18 PM

GhislainG said:
It's just a bit low, but well within the ATX specs of ±10% (11.8V - 13.2V). Don't worry about it if the system is stable.


ATX spec is +/- 5%: 11.4V to 12.6V
a b ) Power supply
January 31, 2009 2:39:35 PM

shabaa said:

.... you can check everything with a DVOM... I always do ... I do not always trust software to check hardware. Especially in this case....


Exactly, software readings for voltages should never be trusted, always use a digital multimeter.
a b ) Power supply
January 31, 2009 7:47:55 PM

theAnimal said:
ATX spec is +/- 5%: 11.4V to 12.6V


You are correct and ± 5% is best, but the ATX 2.01 specs include this note: "At +12 VDC peak loading, regulation at the +12 VDC output can go to ± 10%." That info can be found in this document: http://www.formfactors.org/developer/specs/ATX12V%20PSD...
a b ) Power supply
January 31, 2009 10:10:46 PM

With the current ATX 2.2 there is a 10% tolerance, but only for -5V and -12V.
!