PSU fan speed and temp are sense from motherboard?

  • Thread starter Thread starter mehmet
  • Start date Start date
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mehmet

Q-fan, this question has send group. It has'nt answered. I'm really
want to learn that;

"it(qfan) works on all three fan connectors, what does it use to
judge the temp in order to control the fans? I'm guessing the Chassis
connector might use the motherboard temp sensor, but what about the
Power
connector? Do you need to connect a Power Supply temp sensor in order
for
QFan to work on the Power Fan connector? "

How does Mainboard can sens power supply fan speed, and temp?? Is this
a joke from Asus?
 
mehmet said:
Q-fan, this question has send group. It has'nt answered. I'm really
want to learn that;

"it(qfan) works on all three fan connectors, what does it use to
judge the temp in order to control the fans? I'm guessing the Chassis
connector might use the motherboard temp sensor, but what about the
Power
connector? Do you need to connect a Power Supply temp sensor in order
for
QFan to work on the Power Fan connector? "

How does Mainboard can sens power supply fan speed, and temp?? Is this
a joke from Asus?
Click to expand...

Q-Fan does not work on all three fan headers. I've never seen
any documentation to that effect.

On motherboards which have "Q-Fan", the measured CPU temperature is
used to adjust the CPU fan header voltage.

On motherboards which have "Q-Fan 2":

1) The measured CPU temperature is used to adjust the CPU fan
header voltage.
2) The measured case air temperature is used to adjust the
Chassis fan header voltage. (On motherboards with CHA1 and
CHA2 header, you may find only CHA1 has the adjustment
transistor next to it.)

The original Q-Fan is documented here:
http://web.archive.org/web/20030408094818/http://usa.asus.com/products/mb/qfan.htm

Motherboards with Q-Fan (control of CPU) or Q-Fan2 (control of
CPU and chassis) are listed here. Asus has not been consistent
in their use of those two terms, and some motherboard manuals that
list Q-Fan, in fact have controls consistent with Q-Fan2.

http://web.archive.org/web/20041010021349/http://usa.asus.com/products/mb/feature.htm

I am not aware of any motherboard that has fan control
transistors provided for all three headers. Transistors cost
money, and so only the minimum number (1 or 2) are provided,
according to whether the board is Q-Fan or Q-Fan2.

Many power supplies have their own internal temperature sensing,
and it may take a fair increase in PSU temperature, before the
PSU fan starts to spin faster.

Paul
 
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