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Just got a Neopower 650w, volatges seem too low

post #1 of 11
Thread Starter 
I just installed an Antec Neopower 650w Blue. The thing got very good reviews and it's not exactly cheap (got it from newegg on sale for 100 bucks, it's normally 140) so I expected some quality.
It is really heavy and well built, but when I check the rails (in windows or in bios) the voltages are low.

3.3v @ 3.22V
5v @ 4.81v
12v @ 11.90v

Is this normal? I always thought undervolting was a sign of a weak psu, but I don't know how accurate the software readings are.
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post #2 of 11
its alittle low. mine reads 12.4 on the 12v so i would look into that problem. its always worse to undervolt something that needs that voltage then to over volt it. under volting puts alot more stress on the pieces of hardware on that.
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post #3 of 11
The only Real way to test a PSU is to get a multimeter..
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post #4 of 11
Thread Starter 
I really hope I don't have to rma this thing. Other then the voltage I'm liking it, it's modular and silent.

I couldn't find my multimeter anywhere so right now I'm just going by the software readings. If it means anything, the numbers are rock solid, it's just worrying me it's not getting up to the full 12v.
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post #5 of 11
Don't worry about the voltage in the BIOS, I have a Thermaltake 750watt psw, and in my bios, all the voltages are lower by around 0.3 volts, then I tested the actual with a multimeter and it reported perfectly normal voltages. So I suggest you to measure the "actual" voltage before you panic and return the thing.
post #6 of 11
I have the same PSU and it reads 11.84v (12v) on my Asus Blitz Extreme board, but it reads 12.01v (12v) on my XFX 790i Ultra board (rest of the setup is the same). So I guess it's normal, very motherboard dependant and doesn't mean your PSU is broken.

<3
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post #7 of 11
Quote:
Originally Posted by gamer7 View Post
It is really heavy and well built, but when I check the rails (in windows or in bios) the voltages are low.
That's because you're checking voltages with software. Bad form. BIOS and software voltage readings are notoriously wrong and vary from board to board.

Even if the software was correct, you're still way, way, way within spec. Not sure what reason there is to panic unless you're actually experiencing problems that could be contributed to a faulty PSU.
post #8 of 11
So if I were to check my 12v, will it come out to 18v since theres 18A for each 12v rail?
post #9 of 11
Quote:
Originally Posted by Steve-0 View Post
So if I were to check my 12v, will it come out to 18v since theres 18A for each 12v rail?
No, it should be between 11.8 and 12.4 I believe are the specs.
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post #10 of 11
Quote:
Originally Posted by Steve-0 View Post
So if I were to check my 12v, will it come out to 18v since theres 18A for each 12v rail?
No, you should still read 12v. You could have a 12v rail that supports 1,000 A (amps) and it will still read 12v. On a good PSU that will support high amps and has thick wires , good connectores etc, you might see that it doesn't drop the voltage as much under load as lower quality PSUs.
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