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Power Supply voltage

post #1 of 13
Thread Starter 
I know there is a lot of threads about this, i just wanted an opinion on it. I used a Digital Multimeter to test the PSU voltages. I noticed the +3.3v rails are all 2.7- 2.8 volts. Is it normal to be that low? Everything else is 12.04v, and 5v
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post #2 of 13
How does the 3.3 coincide with bios/software monitoring?
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post #3 of 13
Too low.

+3.135 V to +3.465 V is the range +3.3 V should be at. What PSU is this?

You are using an actual multimeter to test the voltage from orange wire right?
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post #4 of 13
For a psu to be within the standard regulations on voltage it must maintain voltage within 5% of the supposed voltage.

for the 3.3V line it should not fluctuate more than 5%. The voltages you are reporting are representative of a 15% voltage drop from the proposed 3.3V. If these readings are accurate then your PSU is Way out of spec.
Quote:
Originally Posted by v1ral View Post

How does the 3.3 coincide with bios/software monitoring?

What are you talking about? I truly do not understand your question
 
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post #5 of 13
Quote:
Originally Posted by trumpet-205 View Post

Too low.
+3.135 V to +3.465 V is the range +3.3 V should be at. What PSU is this?
You are using an actual multimeter to test the voltage from orange wire right?

I am in kinda the same situation as OP, my 3.3 rail is lower than the +/- that ppl suggest, which I think is 5 percent or something....
But with that said, it's kind of odd that ppl say my HX850 will have no problem powering my system....

Sorry for Off Topic

What exactly does the 3.3 rail power?
if/when it dipps that lower does it have any long term effects on any of the other parts?
My psu isn't even that old.. and it's my second one.. *first one got messed up while using it to fill my water cooling loop, used a 24 pin connector to jump the pump and radiator fans. With this I don't understand how a brand new HX850 can get screwed by putting such a light load on it.

OP I would be conerned, if you have the time/money to RMA/replace the psu then do it....
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post #6 of 13
Thread Starter 
With CPUID PC Wizard 2012 it shows me 3.26 volts for the +3.3V, but when testing the PSU while it not being connected to the computer, it is 2.7-2.8 volts. Is that normal?

Just noticed that it shows me .25 volt for the +5V and the +12v as 10.53 volt lachen.gif

AMD Overdrive shows:

VIN0 is 3.25-3.26 volts

VIN1 is 1.37 volts

VIN2 is 3.06 volts

VIN3 is 10.30- 10.53 volts

VIN4 is 2.18 volts

VIN5 is .05 volts

VIN6 is 1.16 volts

VIN7 is 1.64 volts
Edited by Thedark1337 - 4/18/12 at 7:29pm
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post #7 of 13
+3.3 V powers RAM, legacy PCI slot, and other motherboard circuits.

OP, test your 3.3 V rail when computer is running. You may have to test it from SATA ports.
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post #8 of 13
Thread Starter 
can you tell me how exactly i would do it? Do i need to look at a SATA power cable's diagram to see which ones to test?
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post #9 of 13
Quote:
Originally Posted by trumpet-205 View Post

+3.3 V powers RAM, legacy PCI slot, and other motherboard circuits.

OP, test your 3.3 V rail when computer is running. You may have to test it from SATA ports.

This^

To get accurate voltage readings you must have an active circuit...
 
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Xonar Dg Superlux HD 668B 
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post #10 of 13
Quote:
Originally Posted by Thedark1337 View Post

can you tell me how exactly i would do it? Do i need to look at a SATA power cable's diagram to see which ones to test?

Orange wire carries +3.3 V. What PSU do you have?
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