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How much 12v deviation should I expect?

T

tek538

n00b
Joined
Jan 3, 2006
Messages
55
My +12v reads 10.43v under SpeedFan, is this too much of a gap from where it should be?
 
Your system would crash if it were really that low. I would believe.

That's over 15% deviation. Mine reads 12.5 in the Speedfan but it's 12.02 in the BIOS lol
 
Well, it's crashed once, and that's what made me suspect the pws... the one I have in this system is really cheap, I paid 30 bucks for the case and pws together. I was actually pretty surprised to see it so low because my other system is dead on when it comes to 12v. Time to get a new one I guess!
 
i think its a deviation of 3% thats allowed on psu's well thats what it says on my enermax psu booklets, 12v +/- 3%

i would say that having your 12v rail fall to no lower than 11.700 is acceptable under load, any more and I would think it would be over the 3% margin ? similar with the + maybe 12.5ish.

I dunno what 3% would be, but I would feel happy if the psu was withing those 2 numbers underload.

10v is a fukin catastrophy.

dont rely on software to guage your volts, buy a voltmeter as software is always wrong, sometimes by lots, sometimes by only a few fractions of a V
 
Never ever ever use a power supply that was supplied with a case. There are a few exception to this rule, but in general don't do it.

ATX spec allows up to 5% up or down on the 12v 5v and 3.3v lines, and 10% up or down on the -12v and -5v ines.
That give you:
12v -- 11.4v to 12.6v
5v -- 4.75v to 5.25v
3.3v -- 3.135v to 3.465v
-5v -- -5.5v to -4.5v
-12v -- -13.2v to -10.8v
 
Speed Fan voltage readins shouldn't be trusted, but 30$ case + PSU neither. First thing tomorrow morning buy new PSU.
 
Once more thing, if the voltage is that low, could it damage my system? My video card has a 12v running into it, could the low voltage somehow kill it?
 
I borrowed a multi meter and tested out the 12v, I get a constant 12.26v idle and about 12.21v under load...

I'm still going to get a new pws. I guess I'll have to wait and see if my system freezes up again to see why it happened. Speedfan did a good job of freaking me out, I always thought that program was fairly accurate with stuff.

Thanks for the help.
 
tek538 said:
I borrowed a multi meter and tested out the 12v, I get a constant 12.26v idle and about 12.21v under load...

I'm still going to get a new pws. I guess I'll have to wait and see if my system freezes up again to see why it happened. Speedfan did a good job of freaking me out, I always thought that program was fairly accurate with stuff.

Thanks for the help.
Click to expand...

It's only as accurate as teh chip that's feeding it the information it displays.
 
tek538 said:
Once more thing, if the voltage is that low, could it damage my system? My video card has a 12v running into it, could the low voltage somehow kill it?
Click to expand...

The power supply is the only component that can take an entire system with it when it goes.
 
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