Voltages Q

  • Thread starter Thread starter Same Guy
  • Start date Start date
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Same Guy

I've just done three things:

1. Installed the latest BIOS for my MB.

2. Installed Motherboard Monitor (http://mbm.livewiredev.com/) and it is
compatible with my MB.

3. Installed a new Western Digital 120GB drive.

I have an Enermax Whisper 350W PS.

The MBM is showing my:

+3.30V as 3.39V
+5.00V as 5.19V
+12.00V as 12.22V
-12.00V as -11.99V
-5.00V as -5.33V

I'm not an electrical genius, so is the fact that these numbers are
different from the particular line ratings of concern?

In particular: +5.00V as 5.19V; +12.00V as 12.22V; -5.00V as -5.33V

Thanks for any insight as to what I'm viewing.
 
+/- 5% tolerance is typical of ATX power supplies. You appear to be within
this range.

3.39 / 3.30 = > 2.7%
5.19 / 5.00 => 3.8%
12.22 / 12.00 => 1.8%
-11.99 / -12.00 => -0.1%
-5.33 / -5.00 = > 6.6%

This, of course, assumes you are confident in your measurement technique and
accuracy. Probably not a bad assumption given what you're doing.
 
Same said:
The MBM is showing my:

+3.30V as 3.39V
+5.00V as 5.19V
+12.00V as 12.22V
-12.00V as -11.99V
-5.00V as -5.33V

I'm not an electrical genius, so is the fact that these numbers are
different from the particular line ratings of concern?

In particular: +5.00V as 5.19V; +12.00V as 12.22V; -5.00V as -5.33V

Thanks for any insight as to what I'm viewing.
Click to expand...

All are within specification (+/- 5% on +5, +12, and +/- 10% on -12.)

Matter of fact, the -5v has been dropped alltogether on the latest
ATX specs.
 
Tue said:
+/- 5% tolerance is typical of ATX power supplies. You appear to be within
this range.

3.39 / 3.30 = > 2.7%
5.19 / 5.00 => 3.8%
12.22 / 12.00 => 1.8%
-11.99 / -12.00 => -0.1%
-5.33 / -5.00 = > 6.6%

This, of course, assumes you are confident in your measurement technique and
accuracy. Probably not a bad assumption given what you're doing.
Click to expand...

Thanks.
 
Also, remember that both BIOS and MBM rely on UNCALIBRATED hardware
on the motherboard to read voltages. In other words, the motherboard
manufacturer does nothing to test or verify that those circuits are
reading voltages EXACTLY right.
 
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