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From: Jim Yanik on 12 Jun 2010 19:08
"ian field" <gangprobing.alien(a)ntlworld.com> wrote in
news:bTTQn.27090$g76.4060(a)hurricane:

>
> "Meat Plow" <mhywatt(a)yahoo.com> wrote in message
> news:pan.2010.06.12.22.17.30(a)gmail.com...
>> On Sat, 12 Jun 2010 22:13:51 +0000, Meat Plow ??o??:
>>
>>> On Sat, 12 Jun 2010 21:43:36 +0000, root ??o??:
>>>
>>>> New motherboards often have a small fan covering one of the bridge
>>>> chips. Likewise, expensive graphics cards have a fan on their
>>>> processor. These fans are cheaply made.
>>>>
>>>> Is there protection for the MB/card to keep their chips from frying
>>>> if the tiny little fan fails?
>>>>
>>> No.
>>
>> I'll revise that and say that if said fan is monitored then there can
>> be an audible alert set up if the fan drops below a certain RPM. The
>> fan would need to have three wires to be monitored. Also in BIOS
>> there should be a setting to alert if the mainboard goes over a set
>> temperature limit. The default limits are usually good enough to use.
>>
>>
>
> Some motherboards have thermistors mounted under various chips and
> software included on the setup disk with temp monitor and alarm.
>
> I think my other PC has it, but its not obvious - I'd have to re-run
> the setup disk to find out where it is.
>
> Either that or I didn't bother with it last time I did a clean
> install.
>
>
>

often,before anything fries,you start seeing wierd
things,glitches,freezes,etc.

maybe you could/should build a temp monitoring system,separate from the PC
circuitry,with red LED's that flash when a zone goes overtemp,and voices
"warning,warning" in a robotic voice ala Lost in Space.(use a speech chip
from a greeting card...)
it could even kick in an emergency backup fan,and perhaps even a freeze
spray blast to chill things down.

[end "humor" mode]

--
Jim Yanik
jyanik
at
localnet
dot com
From: AZ Nomad on 12 Jun 2010 19:20
On Sat, 12 Jun 2010 15:25:58 -0700, Dave Platt <dplatt(a)radagast.org> wrote:
>>New motherboards often have a small fan covering one
>>of the bridge chips. Likewise, expensive graphics
>>cards have a fan on their processor. These fans
>>are cheaply made.
>>
>>Is there protection for the MB/card to keep their
>>chips from frying if the tiny little fan fails?

>On most motherboards built today, there's a temperature sensor
>associated with the CPU (sometimes several e.g. individual temperature-
>sensing diodes in the CPU's cores) and others on the board. The
>sensor values can be read out (often via SMBUS) by the BIOS or other
>software.

>Better motherboards use three-wire fans with tachometers, where the
>tach frequency can be read out of the sensor chip.

I've yet to see a motherboard that did anything with the chipset fan
speed data. You can run an application that'll monitor it, but almost
nobody goes to the bother as most such applications, written for
microsoft windows, were modeled to resemble someting out of a comic
book and are an eyesore even when minimized. Linux' lmsensors doesn't
require such an eyesore on the desktop, but is a bit of a PITA to set
up.

The better motherboards either use a quality fan or a heatpipe to a
heatsink cooled by the cpu fan.
From: Meat Plow on 12 Jun 2010 19:30
On Sat, 12 Jun 2010 18:08:50 -0500, Jim Yanik ǝʇoɹʍ:

> "ian field" <gangprobing.alien(a)ntlworld.com> wrote in
> news:bTTQn.27090$g76.4060(a)hurricane:
>
>
>> "Meat Plow" <mhywatt(a)yahoo.com> wrote in message
>> news:pan.2010.06.12.22.17.30(a)gmail.com...
>>> On Sat, 12 Jun 2010 22:13:51 +0000, Meat Plow ??o??:
>>>
>>>> On Sat, 12 Jun 2010 21:43:36 +0000, root ??o??:
>>>>
>>>>> New motherboards often have a small fan covering one of the bridge
>>>>> chips. Likewise, expensive graphics cards have a fan on their
>>>>> processor. These fans are cheaply made.
>>>>>
>>>>> Is there protection for the MB/card to keep their chips from frying
>>>>> if the tiny little fan fails?
>>>>>
>>>> No.
>>>
>>> I'll revise that and say that if said fan is monitored then there can
>>> be an audible alert set up if the fan drops below a certain RPM. The
>>> fan would need to have three wires to be monitored. Also in BIOS there
>>> should be a setting to alert if the mainboard goes over a set
>>> temperature limit. The default limits are usually good enough to use.
>>>
>>>
>>>
>> Some motherboards have thermistors mounted under various chips and
>> software included on the setup disk with temp monitor and alarm.
>>
>> I think my other PC has it, but its not obvious - I'd have to re-run
>> the setup disk to find out where it is.
>>
>> Either that or I didn't bother with it last time I did a clean install.
>>
>>
>>
>>
> often,before anything fries,you start seeing wierd
> things,glitches,freezes,etc.
>
> maybe you could/should build a temp monitoring system,separate from the
> PC circuitry,with red LED's that flash when a zone goes overtemp,and
> voices "warning,warning" in a robotic voice ala Lost in Space.(use a
> speech chip from a greeting card...)
> it could even kick in an emergency backup fan,and perhaps even a freeze
> spray blast to chill things down.
>
> [end "humor" mode]

Ummm not to spoil your humor however, there is/was a PCI card and front
panel that did just that. Designed for those who used to overclock their
systems and run them on the ragged edge.
From: Meat Plow on 12 Jun 2010 19:34
On Sat, 12 Jun 2010 18:20:19 -0500, AZ Nomad ǝʇoɹʍ:

> On Sat, 12 Jun 2010 15:25:58 -0700, Dave Platt <dplatt(a)radagast.org>
> wrote:
>>>New motherboards often have a small fan covering one of the bridge
>>>chips. Likewise, expensive graphics cards have a fan on their
>>>processor. These fans are cheaply made.
>>>
>>>Is there protection for the MB/card to keep their chips from frying if
>>>the tiny little fan fails?
>
>>On most motherboards built today, there's a temperature sensor
>>associated with the CPU (sometimes several e.g. individual temperature-
>>sensing diodes in the CPU's cores) and others on the board. The sensor
>>values can be read out (often via SMBUS) by the BIOS or other software.
>
>>Better motherboards use three-wire fans with tachometers, where the tach
>>frequency can be read out of the sensor chip.
>
> I've yet to see a motherboard that did anything with the chipset fan
> speed data. You can run an application that'll monitor it, but almost
> nobody goes to the bother as most such applications, written for
> microsoft windows, were modeled to resemble someting out of a comic book
> and are an eyesore even when minimized. Linux' lmsensors doesn't
> require such an eyesore on the desktop, but is a bit of a PITA to set
> up.
>
> The better motherboards either use a quality fan or a heatpipe to a
> heatsink cooled by the cpu fan.

For the most part decent mainboard provide enough surface area to their
Northbridge chipset and onboard video to be passively cooled. The extreme
end boards offer heatpipes and fancy servo fans.
From: Sylvia Else on 12 Jun 2010 22:56
On 13/06/2010 7:43 AM, root wrote:
> New motherboards often have a small fan covering one
> of the bridge chips. Likewise, expensive graphics
> cards have a fan on their processor. These fans
> are cheaply made.
>
> Is there protection for the MB/card to keep their
> chips from frying if the tiny little fan fails?
>
> TIA

I have a fanless NVIDIA based graphics card that I was running with
inadequate ventilation. When used on graphics intensive tasks, it
started behaving as if there was increasing fog in the scene being
viewed. This would have reduced the amount of processing it needed to
do. The GPU didn't fail, and this effect was apparently invisible to the
software driving it. I infer that it was a designed response to excess
temperature.

A fan cooled version with a failing fan would presumably do the same thing.

Sylvia.
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