How 2 control fan speed in P4s800d-X?

Hi All,

In my system the CPU fan speed seems very much constant, no matter how
cool or warm the CPU is.

On a previous Asus motherboard, I could control something like a
"ratio status", which apparently made the CPU perform faster or
slower, and the CPU would adjust accordingly, both after start up, and
during operation, as the I ran CPU intensive tasks, or light ones.

Bottom line:

1) How can I set the CPU to work slower than its maximum speed, and
start with a correspondent cpu fan speed, and
2) How can I have the CPU fan speed vary accordingto the cpu
temperature - presently, Asus PC Probe tells me the CPU is running at
around 38 degress C.

TIA,
JBR

 

There is no mention of Q-Fan in the manual, so your board doesn't
have that feature. Asus motherboards support fan control on
zero channels, one channel (Q-fan), or two channels (Q-fan2).
So some motherboards have no support for it.

But I would not give up without a fight. Get a copy of Speedfan
from almico.com . Experiment with it and see if there is any
response.

Generally the necessary hardware support is "almost free".
Frequently, Super I/O chips used on the motherboards, do have
fan speed control logic. The ingredient that makes it all work,
is the presence of an interface transistor near the fan header.
Without the transistor and associated circuit, there is no
way for the control signal to get to the fan. Since the
transistor costs money to add to the motherboard, on a board
without Q-fan it might be missing.

Looking at a picture of your motherboard, I do see a transistor
near the fan header, and that is why I'm recommending you try
out Speedfan. Your motherboard is not listed on the almico
site, but maybe Speedfan will still be able to see your
Super I/O chip anyway.

If that does not work out for you, a simple manual control
solution (to fix the fan speed), is to get a Zalman Fanmate2.
It has a three pin male and a three pin female interface on
it. Turning the knob on the controller, adjusts the +12V
lead sent to the fan.

A much more expensive solution (costing more than your
motherboard perhaps), would be a T-Balancer. That device
measures temperature and sets fan speed based on the
temperature. It is more suited to "price unlimited"
computer builds.

Paul