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

PAPADOC · Sep 25, 2007

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 · Sep 25, 2007

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 · Sep 25, 2007

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

PAPADOC · Sep 25, 2007

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 · Sep 25, 2007

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.

keakar · Sep 25, 2007

PAPADOC said:
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 · Sep 25, 2007

sounds like your PSU is dying

kwchang007 · Sep 25, 2007

Multi meter is the most reliable.

largon · Sep 26, 2007

3991vhtes said:
sounds like your PSU is dying

:shadedshu :banghead:

No.
It definitely does not sound like it.

panchoman · Sep 26, 2007

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

System Name	VENOM
Processor	AMD Phenom X6 1045T @ 4GHz
Motherboard	ASUS M5A97 R2.0
Cooling	Thermalright Ultra-120 Extreme (with Noctua NF-S12B FLX fan - N.A.)
Memory	Kingston KHX1600C10D3B1K2/16G 16GB Kit 2X8GB 1600MHz
Video Card(s)	Radeon XFX HD 4890 w/ HR-03 GT + Noctua NF-B9 fan - L.N.A.)
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Case	Cooler Master HAF X
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Power Supply	Corsair AX850 GOLD
Software	Windows 7 64bit

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Motherboard	ASUS Striker Extreme & eVGA 680i A1
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Video Card(s)	EVGA 8800 GTX
Storage	Western Digital 320 GB
Case	Antec 900
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Software	Vista Ultimate

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Motherboard	Compaq Laptop Mobo
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Storage	40GB 5200RPM HP
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Audio Device(s)	Onboard Realtek
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Software	Windows XP Pro

System Name	VENOM
Processor	AMD Phenom X6 1045T @ 4GHz
Motherboard	ASUS M5A97 R2.0
Cooling	Thermalright Ultra-120 Extreme (with Noctua NF-S12B FLX fan - N.A.)
Memory	Kingston KHX1600C10D3B1K2/16G 16GB Kit 2X8GB 1600MHz
Video Card(s)	Radeon XFX HD 4890 w/ HR-03 GT + Noctua NF-B9 fan - L.N.A.)
Storage	Seagate 500GB SATA2 16MB Cache
Display(s)	BenQ 24" FP241VW LCD HDMI
Case	Cooler Master HAF X
Audio Device(s)	Creative Audigy 2ZS
Power Supply	Corsair AX850 GOLD
Software	Windows 7 64bit

Processor	Amd Athlon X2 4600+ Windsor(90nm) EE(65W) @2.9-3.0 @1.45
Motherboard	Biostar Tforce [Nvidia] 550
Cooling	Thermaltake Blue Orb-- bunch of other fans here and there....
Memory	2 gigs (2x1gb) of patriot ddr2 800 @ 4-4-4-12-2t
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Audio Device(s)	Onboard- Why get an sound card when you can hum??
Power Supply	Antec NeoHe 550-manufactured by seasonic -replacement to the discontinued smart power series
Software	Windows XP pro SP2 -- vista is still crap

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

PAPADOC

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d44ve

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POGE

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PAPADOC

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panchoman

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keakar

3991vhtes

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kwchang007

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largon

panchoman

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Power Supply	CORSAIR SU-750TX 750W ATX12V / EPS12V
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Processor	AMD Athlon 64 3800+ Venice 2.4GHz
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