Re: Can a weak CMOS battery prevent detection of a drive

"Paul" <[email protected]> wrote in message 
news:[email protected]...
> Norm Why wrote:
>> [spippage]
>>> Typical low CPU load core temperatures of the Q9650 are:
>>> 31C., 31C., 28C. and 32C.
>>> Thermal Grizzly Kryonaut thermal grease works great! However, the MOBO 
>>> manual suggests that optional fans be installed to avoid overheating. 
>>> The manual can be found by Google'n 'Gigabyte GA-EP45-DS3L .PDF'
>>>
>>> I have a Cougar MX330-X gaming case whose manual can be found here:
>>> https://cougargaming.com/fileadmin/downloads/USERS_MANUAL/MX330_X_usermanual.pdf
>>>
>>> Note that 5 optional fans can be installed. CPU and Fan N are installed 
>>> and their 4-pin fan headers are occupied. According to the MOBO manual 
>>> there are 2 3-pin fan headers up for grabs.
>> [snip]
>>> According to the BIOS, installed fans can be set to sound an alarm if 
>>> fans fail or CPU exceeds 80C. However, the beep speaker has been silent 
>>> for a long time. There is an little known beep code. The absence of a 
>>> beep confirmation at boot time indicates something is wrong. Maybe what 
>>> is wrong is the beep speaker?
>>>
>>
>> I should also mention that on one side of the MX330-X case are cutouts 
>> for switches labeled 'FAN1' and "FAN2'. The 2 3-pin fan headers on the 
>> MOBO seem to report to the BIOS. Switched fan power would not so report. 
>> The question is which fans should be connected to the 2 3-pin fan headers 
>> and which should be power switched? And where to get the power?
>>
>> Thanks.
>
> A motherboard can have fan headers that only provide power (+12V and GND).
> Check your manual for details like that.
>
> A motherboard will have at least three channels with RPM counters.
> (+12V, GND, RPM). The RPM signal is 2ppr, two pulses per revolution.
>
> THe most exotic headers, are ones with speed control. In the old days,
> the three pin connector could have voltage control of the +12V pin.
> There would be a 100uF cap next to the fan header plus a transistor.
>
> On modern motherboards, the header is a four pin, and has +12V GND RPM 
> PWM.
> The PWM is a pulse width modulation control that sets the fan speed.
> The RPM has the 2ppr thing. The +12V in this case stays at +12V.
>
> You save the fan headers with working RPM pin, for the fans that have
> an RPM signal :-)
>
> The cheapest case cooling fans, have no RPM signal. They just have
> +12V and GND. You connect them to unmonitored headers, or get
> a Molex to fan adapter and power the fan that way,
>
> The next level of fan has an RPM signal. You can plug those to
> a three or four pin header equipped with RPM.
>
> The CPU fan header pretty well always has RPM. The CPU cooler
> has the third wire with the RPM signal on it. The more modern
> CPU fans have all four wires +12V GND RPM PWM, even if you're
> not using the PWM and have decided to run the fan at full speed.
>
> Based on the above, you have a pool of electromechanical devices,
> you have your various fan headers, you have molex connectors, now
> you head off and do your planning.
>
> Nothing says you need seven fans, to have a "lucky" computer.
>
> My newest machine, has one fan on the back (to establish a
> low delta_T between inside case air temp and external ambient).
> It has a second fan positioned as a blower over VCore, as
> VCore doesn't have proper cooling and runs at 65C surface temp.
>
> The CPU cooler is huge, and it has a fan with both
> RPM and PWM.
>
> And that's it.
>
> If the case air is getting too hot (warm cloud around
> CPU cooler), then I use the 37.5mm thick fan and put it
> in the back of the computer for exhaust.
>
> Generally you aim for a "direction" of airflow. Like input
> on the front, exhaust on the back. And arrange the fans
> so they're not working against one another. For example,
> it's pretty hard to install a "side" fan in the door, and
> arrange it so it has a deterministic airflow. I did do a
> seven fan setup once, and one of the fans, if you held
> a tissue next to the fan, there was zero airflow, which
> tells you the fans were working against one another.
>

After we have meticulously set up the air flow, you can get smoke pellets & 
matches for testing flues, we then go & stick the PC back in its cubby hole 
under the desk & undo all the good work.
Cynic.! Moi? Never. :)

-- 
Regards
wasbit