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SpeedFan is our application of choice for customizable fan control. If properly
supported, it can be configured to raise/lower multiple fan speeds to designated
limits when any specified temperature threshold is breached.
SpeedFan and PC Health.
The screenshot above shows the correlation between SpeedFan's readings and
the temperature and fan speed sensors. Most of the readings in SpeedFan were
corroborated by Gigabyte's EasyTune utility, though there was a mysterous "Temp3"
that seemed to rise with CPU temperature but it was in a much higher range
between 70°C and 100°C. Also, we could not locate the sensor for the
so-called "System" temperature increasing the cooling around
the southbridge, northbridge and VRM areas did not lower this reading during
SpeedFan can be configured to control both the CPU and Chassis fan headers.
Setting PWM modes 1 and 2 in the Advanced menu from "SmartGuardian"
to "Software Controlled" enables the speed controls. They offer a
full range of control for both PWM and DC fans.
If you prefer to use the board's own Smart Fan feature, it does work fairly
well. We tested it by connecting the fan on the CPU cooler to a variable DC
fan controller set to a relatively low 5V and proceeded to stress the processor
using CPUBurn. The CPU and Chassis fan speeds were monitored and graphed using
SpeedFan. A Scythe 80mm connected to the Chassis fan header stayed at about
860RPM (7V) throughout testing. A Scythe 92mm PWM fan connected to the CPU fan
header started out at 400RPM until the core temperature reached 34°C at
which point it began to gradually ramp out. It increased in speed incrementally
about 50RPM for every two degrees until it hit 42°C when the increase in
speed doubled. It eventually reached the fan's maximum speed of 2560RPM at approximately
66°C. On some boards the fan throttles quite abruptly when certain target
temperatures are reached. The exact opposite was the case here as the fan increased
in speed very smoothly.
The default Smart Fan settings.
Smart Fan's behavior can actually be customized using the EasyTune utility.
By default the minimum fan setting is 31% and the minimum and maximum temperatures
(the range in which the CPU fan speed will increase) is 20°C and 65°C
respectively. The range can be adjusted to how fast you prefer the CPU to ramp
up in speed. Note the the maximum fan speed cannot be changed it is stuck
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