- Joined
- Jun 28, 2004
- Location
- redding, California
My motherboard went bad so i rma'd it and got a new one. But now my 12v rail which used to be at 12.20v is at 11.84v, 5v was at 4.945v and now its at 4.865v. Whats happening? Everything is in sig.
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Rails low after new mobo?
- Thread starter Jacobman
- Start date
How are you measuring these numbers? If you're using the motherboard's reported values, that is probably the problem, they tend to vary between mobos. If you're using a voltmeter or multimeter, or whatever they're called, then I have no idea.
- Joined
- May 6, 2003
- Location
- Buried in UPS packages
Are you reading this from the mb program like mbm5 or from a meter on the plug? If yo uare using BIOS or a program test it with a volt meter, you will probably find there is nothing wrong.
- Joined
- Dec 20, 2000
- Location
- Albany, NY
Got all the plugs hooked up?
- Joined
- Mar 25, 2004
- Location
- Ontario, Canada
if you're using the onboard sensors, they are pretty inaccurate. Even a bios update can alter them in a positive/negative way. I would take the other's advice and use a digital multimeter.
Everytime I've measured an Asus board, I've found the difference to be about 2% from the onboard sensors vs multimeter. That may not sound like much but when the standard is 5% deviance, it means something.
Everytime I've measured an Asus board, I've found the difference to be about 2% from the onboard sensors vs multimeter. That may not sound like much but when the standard is 5% deviance, it means something.
- Joined
- Aug 31, 2004
- Location
- Stamford, CT
I have hooked up the exact same power supply to 3 different motherboards and had my 12v rail reported between 11.4volts and 12.2volts with the voltage reporting software.
Unfortunatly you just can't trust the voltage readings nor the temperature readings from bios or the software monitor programs.
Unfortunatly you just can't trust the voltage readings nor the temperature readings from bios or the software monitor programs.
- Joined
- Dec 28, 2001
- Location
- Corner of No and Where
Any kind of mobo sensor- temp or voltage- is notoriously inaccurate. A multimeter is your friend, even a cheap one. (At least you get consistent reading in different systems.)
One possibility that is not often mentioned is a loose psu connection to the mobo.
If the atx (and aux or whatever connector is around!) is too loose it can add resistance, reducing the voltage that gets to the motherboard.
One possibility that is not often mentioned is a loose psu connection to the mobo.
If the atx (and aux or whatever connector is around!) is too loose it can add resistance, reducing the voltage that gets to the motherboard.
OP
- Joined
- Jun 28, 2004
- Location
- redding, California
- Thread Starter
- #8
Well i dont think anything is loose in it because i just had all the parts put back in my case but i will check again. I do have a multi-meter, but which plugs on one of my molex connectors do i plug the red and black into? And what setting should the multimeter be at, also is it DC or AC?
- Joined
- Mar 25, 2004
- Location
- Ontario, Canada
black is ground.
DC is what you're measuring.
red = 5v. yellow = 12v. Orange (ATX connector, SATA) is 3.3v
DC is what you're measuring.
red = 5v. yellow = 12v. Orange (ATX connector, SATA) is 3.3v
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