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When it comes to customizable control, SpeedFan is our application of choice.
If properly supported, it can be configured to raise/lower multiple fan speeds
to designated limits when any specified temperature threshold is breached.
SpeedFan main screen, edited with correlations.
SpeedFan duplicates most of the functionality of the Asus PC Probe application,
except for the +5V and +12V readings. Unfortunately, it is only capable of controlling
the Chassis fan header the Speed01 and Speed02 controls are tied to the
same header. To enable fan control, set PWM modes 2 and 4 in the Advanced menu
to "Manual PWM Control."
As an alternative, the Asus Fan Xpert utility is surpringly versatile. You can
set preset profiles for the CPU and Chassis fans, some of which are not available
in the BIOS menu. It also illustrates exactly how each setting behaves with
a small CPU temperature vs. fan speed graph.
Fan Xpert custom profile settings.
There is also a User profile which can be set with your own custom parameters.
On the graph there are three temperature/fan speed points that can be altered
to adjust the curve however you see fit.
We tested the fan control system by connecting the fan on the CPU cooler to
a variable DC fan controller set to only 4V and proceeded to stress the processor
using Prime95. A 92mm Scythe Kama Flow 2500RPM PWM fan was connected to the
CPU fan header and a Scythe 80mm Kama Flex 1500RPM fan to the Chassis fan header
and their speeds were monitored using SpeedFan. We found that the fans ramped
up exactly according to the parameters reported by the Fan Xpert utility.
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