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Idle voltage is way too low on my +12v psu rails?

PAPADOC

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#1
I have the Antec Phantom 500W psu.
It has 2x +12v rails, one is at 18A the other at 17A.

Now I am in the process of overclocking my Q6600.
It's stable right now at 3.6Ghz.

But when I load windows and I check the voltage on the +12v rail, I get a reading of about 3.46v. I get the same reading from : MBProbe, SisoftSandra and Speedfan.

This also occurs when i have the processor at STOCK voltage and speed (1.3v & 2.44Ghz)

But when I measure the +12v rail with my multimeter I get a reading of 12.04v.

Now the strange thing is when I start loading the cores running Prime95 , the apps above start reading a higher voltage on the +12v rail, eventually reading very close to 12v when all 4 cores are running at max.

Is my PSU's +12v rail busted or I need one with a better +12v rail?
 

d44ve

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#2
There is a reading that is supposed to be in that range of 3v.... I cant remember what it is off the top of my head. Are you sure you are looking at the correct voltage reading?
 

POGE

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#3
Multimeter readings are most reliable, if it says its around 12 then your fine. Check it at load with a multimeter.
 

PAPADOC

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#4
Idle voltage is way low on my +12v psu rails?

Yeah I'm sure I'm looking at the correct voltage.

Ok thanks POGE , I'll trust my multimeter.
 

panchoman

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#5
if it was like that, your system most likely wouldn't be operating, use the bios (pc health section.. or similair) and if thats absurd then use a multimeter. for me its like 11.96 on the 12v rail and similair for the others.
 
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#6
I have the Antec Phantom 500W psu.
It has 2x +12v rails, one is at 18A the other at 17A.

Now I am in the process of overclocking my Q6600.
It's stable right now at 3.6Ghz.

But when I load windows and I check the voltage on the +12v rail, I get a reading of about 3.46v. I get the same reading from : MBProbe, SisoftSandra and Speedfan.

This also occurs when i have the processor at STOCK voltage and speed (1.3v & 2.44Ghz)

But when I measure the +12v rail with my multimeter I get a reading of 12.04v.

Now the strange thing is when I start loading the cores running Prime95 , the apps above start reading a higher voltage on the +12v rail, eventually reading very close to 12v when all 4 cores are running at max.

Is my PSU's +12v rail busted or I need one with a better +12v rail?
it is normal to get a small voltage drop from idle when you load the system but 3.46v cant be correct, it must be crossing up the reading with your 3.3v rail somehow. maybe a board sensor thing.

check for updates for your bios, it sounds like a reading problem not anything to worry about. as said before the multimeter is "the" accurate voltage checker.
 

3991vhtes

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#7
sounds like your PSU is dying
 
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#8
Multi meter is the most reliable.
 
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#9

panchoman

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#10
if the 12v rail was running at 3v, i doubt his system could run.