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From: PeterD on 13 Jun 2010 08:35
On Sat, 12 Jun 2010 22:17:21 +0000 (UTC), Meat Plow
<mhywatt(a)yahoo.com> wrote:

>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.

Not necessarily true. THe chipset could easily have an
over-temperature detection circuit built into the die. At least that's
how I'd do it, since that would detect multiple problems that
monitoring just the fan's rotation would not do. After all, a fan
turning is not always a fan delivering power!

>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.

From: Meat Plow on 13 Jun 2010 10:36
On Sun, 13 Jun 2010 08:35:38 -0400, PeterD ǝʇoɹʍ:

> On Sat, 12 Jun 2010 22:17:21 +0000 (UTC), Meat Plow <mhywatt(a)yahoo.com>
> wrote:
>
>>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.
>
> Not necessarily true. THe chipset could easily have an over-temperature
> detection circuit built into the die. At least that's how I'd do it,

<snip>

No of course it's not necessarily true. I can't speak for every frigging
manufacturer out there. Certainly both cases are true, MB temperature
monitors and monitored fans and both. My MSI MB has a monitored rear
120mm fan and MB temperature monitoring. Most of the boards I've dealt
with are Intel, Asus, and MSI. I can only recall one using a small fan on
the pci bridge chip. The rest were equipped with a large heat sink. The
emphasis on using one large fan in the rear to quietly exhaust inside air
rather than having a bunch of small 5000 rpm fans making a racket.
From: Jeff Liebermann on 13 Jun 2010 12:28
On Sat, 12 Jun 2010 21:43:36 +0000 (UTC), root <NoEMail(a)home.org>
wrote:

>Is there protection for the MB/card to keep their
>chips from frying if the tiny little fan fails?

Some do, most don't. Most machines require running applications
software to monitor the cpu, mb, hd, fan speed, etc, which then
initiates a shutdown. This is typical:
<http://www.hmonitor.com>
Other motherboards (some Dell's) have the monitor built into the BIOS.
Most CPU's will protect themselves from overheating by slowing down
the clock. Motherboards with this feature usually allow setting the
overtemp alarm threshold. This is common in server BIOS's. If you
see a "thermal event shutdown" in the BIOS log file, the computer was
turned off automagically due to overheating or fan failure.

Intel provides various monitoring utilities:
<http://www.intel.com/support/motherboards/desktop/sb/cs-012552.htm>

You're correct to worry about the survivability of the little fans.
Once they overheat, they melt. When they melt, they slow down or
stop. You might have some luck tearing the fan apart and applying
some oil, but that only lasts for a few weeks. Replacement is the
only real option. If you want to keep your unspecified model
motherboard fan alive, keep the dust and crud out. Breaking it loose
with a paint brush, and blowing the case clean with an air compressor
is my method.


--
Jeff Liebermann jeffl(a)cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
From: Sofa Slug on 13 Jun 2010 15:35
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

There is a cheap "Fan Alarm System" card available:
http://www.outletpc.com/c1685.html
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