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What 3.3V voltage does ?

post #1 of 7
Thread Starter 
Anyone knows what 3.3V is meant for, what is powering ?

Judging by aida64, my 3.3V in idle stays between 3.28V and 3.296V, and in games is 3.26V and 3.28V

Could be a problem ? The 12V is stable at 12.00V, and the GPU+12V is at 12.172V in idle and 12.140V in load.
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post #2 of 7
Quote:
Originally Posted by CalinTM View Post

Anyone knows what 3.3V is meant for, what is powering ?

Judging by aida64, my 3.3V in idle stays between 3.28V and 3.296V, and in games is 3.26V and 3.28V

Could be a problem ? The 12V is stable at 12.00V, and the GPU+12V is at 12.172V in idle and 12.140V in load.

 

Software is notorious for being inaccurate, so there's no way to know if these are accurate readings. My guess is they're not accurate at all (I would bet that your +3.3V rail is just about perfect).

 

Anyway, here's what each rail powers:

 

http://www.overclock.net/t/722251/on-psu-voltages

 

Here's an excerpt of just the +3.3V:

 

 

Quote:
Originally Posted by Phaedrus2129 View Post

+3.3V
Nominal value: 3.30V
Allowed voltage variation: +/-5%, 3.14V - 3.46V
Preferred voltage variation: +/-3%, 3.20V - 3.40V
Allowed ripple: <50mV
Preferred ripple: <30mV
Info: The 3.3V was also a major power source in old power supplies, though not today. It plays many minor roles, and should still be just as tightly regulated as the +12V and +5V.
It powers:
Some motherboard chipsets
RAM modules
Graphics card onboard control circuitry
Some PCI cards



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post #3 of 7
Thread Starter 
Well Enermax is known for having problems on the 3.3 rail, that is why im asking.
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post #4 of 7

Oh, I didn't know that.

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post #5 of 7
Thread Starter 
Yeah, almost all reviews of enermax say something about the 3.3 rail, i don't know if the ripple, or something else. Let's say in gaming is 3.26, could be a problem ?
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post #6 of 7
Quote:
Originally Posted by CalinTM View Post

Yeah, almost all reviews of enermax say something about the 3.3 rail, i don't know if the ripple, or something else. Let's say in gaming is 3.26, could be a problem ?

 

If this reading is accurate, then it probably will. I mean, review the information in the excerpt above on the +3.3V rail. Notice the allowed voltage variation and the preferred variation, but also take notice of what it powers. So, I would say that it could be a problem for any of those things.

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post #7 of 7
My RIVE tells me in the BIOS that my 3.3v rail is putting out 3.281v (HALE90), but my Fluke DMM shows 3.293v. I wouldsstronglyrrecommendmmonitoringwwith a DMM, and it doesn't have to be an expensive Fluke, just a $20 unit from the store will do just fine (the expensive ones are, however, almost mandatory when you need accurate to the fifth decimal or greater, IME).

I would be extremely surprised if the software reading is close to accurate...
   
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