Digital Multimeter Or Motherboard Readout?

bryan_d · May 23, 2005

Hello all,

Which one should I trust? My multimeter reads my voltages at the right values but my MB says different? I took the readings off of one of the molex's on the PSU. They read 12.01V and 5.02V but my MB reads 11.916V and 4.945V.

I was thinking that maybe the motherboard might be right because those are the voltages after they have gone through the MB and the CPU/RAM/NB/SB right?

Thank you for all your help and suggestion in advance,
Bryan D.

Dell_Axim · May 23, 2005

It has to do with voltage drops due to resistance (IR voltage drops). If you measure the voltage at the input to the voltage regulation circuits, it should be closer to the reported value.
Many motherboard sensors are also inaccurate.

BrutalDrew · May 23, 2005

It is alwasy best to use a multimeter.

OCS911 · May 23, 2005

use Multimeter to measure while PC ON and try full load and measure again so you know your idle voltages and load voltages

BrutalDrew · May 23, 2005

This may help too:
http://forums.extremeoverclocking.com/showthread.php?t=137886

meionm · May 23, 2005

trust multimeter,

joot · May 24, 2005

Multimeter all the way !!!

bryan_d · May 24, 2005

Thanks all,

I will try the load values tonight. Thanks for the link as well!

Bryan D.

Digital Multimeter Or Motherboard Readout?

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