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CPUID HWMonitor



 
 
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  #1  
Old June 23rd 19, 07:52 AM posted to alt.comp.hardware
Norm X[_2_]
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Posts: 91
Default CPUID HWMonitor

Hi,

CPUID HWMonitor warned me that the MOBO value of -12 V was -0256 V. Is this
anything to sweat?


  #2  
Old June 23rd 19, 12:01 PM posted to alt.comp.hardware
Paul[_28_]
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Posts: 1,467
Default CPUID HWMonitor

Norm X wrote:
Hi,

CPUID HWMonitor warned me that the MOBO value of -12 V was -0256 V. Is this
anything to sweat?


I would want to check that under a second or third tool.

If you have a Linux DVD, you could try from that side of the fence.

To measure -12V, the 0 to 4.095V input needs a scaling resistor.
Say for example, I fitted a two resistor attenuator network that
scaled the input by 1/4. The ADC would measure "3 volts". It's up
to the HWMonitor program to multiply the value by 4/1 to get
the correct voltage. (I presume the ADC has a sign bit but sometimes
even that is fudged with an external bias network.)

At one time, we only knew by trial and error, what the scaling
resistors on each input were.

But modern programs seem to be getting scaling info from the
BIOS some how. I've not seen a description of the ACPI table
that might be providing that info. I no longer see "lots of
questions" about how a new motherboard behaves, so the info
is coming from places other than end-user testing.

The -12V is not critical to hardware operation. Typically,
+12V and -12V are used by TI 75232 RS232 driver chips. You can
get RS232 chips with charge pumps, which means a number of
larger value ceramic capacitors to hold the charge that
the pumps generate. But some motherboard makers still
use +12V and -12V and conventional RS232 chips. That's
about the only consumer of -12V I know of right off hand.

Several generations of motherboard ago, there were a few
OP Amps used for doing voltage regulation, and those could
benefit from a negative swing supply. So there may be other
fairly important things like that, needing a negative voltage,
in which case you would not want the -12V going too nuts.

The voltages on the ATX supply are established by "turns ratio".
If your 3.3V, 5V, 12V are correct, it's pretty hard for
the voltage to go "purely nuts". Some supplies shut down
(PWR_GOOD de-asserted) if rails are out of spec, but I
don't know if -12V is actually a term in PWR_GOOD and
maybe -12V is being ignored.

The main ATX connector is always available for probing
with a $20 multimeter, which will give a means of
verifying the values. The connector pinout can be
seen on the Playtool site, about half way down the page.

http://www.playtool.com/pages/psucon...onnectors.html

You can ground the multimeter on an I/O plate screw
for the black lead of the multimeter. Use the 20V full
scale range. Then, use the red lead to check DC voltage.
All voltages should be within 5% of nominal.

The meter probe can be shoved into the plastic shell of the
main connector, where the wire goes into the shell. The pin
in there, has enough exposed metal, for you to be able to
take a reading. By clipping the black meter probe onto the
I/O plate as a ground screw, this prevents the meter
probes from getting too close together and shorting
out the ATX supply.

If the supply is actually out of spec, I would change it out.
That's if you want everything to work. On relatively
modern motherboards, if there's no RS232, most
of the onboard regulation tasks are done by dedicated
chips (not cheesy OP Amp circuits), and really nothing
else should depend on -12V.

*******

Try reading it with Speedfan, which also prints the voltages.
For best results, don't run two hw monitor programs at the
same time.

http://almico.com/sfdownload.php

http://almico.com/speedfan452.exe

Paul



Paul
  #3  
Old June 30th 19, 05:20 AM posted to alt.comp.hardware
[email protected]
external usenet poster
 
Posts: 220
Default CPUID HWMonitor

On Sunday, June 23, 2019 at 7:01:33 PM UTC+8, Paul wrote:

I would want to check that under a second or third tool.


Yeah, like the CPU temperature reported by memtest86+ seems to be rather too
high. On one rig, it claimed 99 degrees C. I had set BIOS to beep beep at 80,
but it wasn't triggered. Also trying lm_sensors with all cores loaded, it
only went to high 60s.
  #4  
Old July 3rd 19, 03:07 PM posted to alt.comp.hardware
Norm X[_2_]
external usenet poster
 
Posts: 91
Default CPUID HWMonitor

wrote in message
...
On Sunday, June 23, 2019 at 7:01:33 PM UTC+8, Paul wrote:

I would want to check that under a second or third tool.


Yeah, like the CPU temperature reported by memtest86+ seems to be rather
too
high. On one rig, it claimed 99 degrees C. I had set BIOS to beep beep at
80,
but it wasn't triggered. Also trying lm_sensors with all cores loaded, it
only went to high 60s.


Hey, Start with Real Temp 3.7X. It has sensor calibrations. When calibrated,
temperatures seem reasonable and clearly show the benefit of better thermal
grease. CPUID HWMonitor temperatures are then credible. BIOS temperatures
are incomplete. I set my BIOS Temp alarm to 70 C. In one booboo, CPU use
went to 110% and then the BIOS alarm sounded constantly. I needed to reset
the BIOS, to return sanity to the PC. What does memtest86+ have to do with
temperature? Your memory is worse than mine!

I drive a used car out of economic necessity. Likewise my MOBO is 10+ years
old but all parts are new. Works good. Recently, after much trial and
tribulation, I came to the realization that I need a new CPU cooler. My auto
needs a new PCV valve. Go figure.


 




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