Asus P5N7A-VM: Geforce 9300 IGP

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Fan Control

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 Asus' PC Probe application, except for the +5V reading. To enable fan control, set PWM modes 2 & 4 in the Advanced menu to "Manual PWM Control." Speed02 and Speed04 provide full control for the CPU and CHA fan headers respectively.

Q-Fan

We tested the board's Q-Fan feature by connecting fans to the CPU and CHA fan headers, but connecting the CPU cooler's fan to a variable DC fan controller, so we could lower it as necessary. We then proceeded to stress the processor using Prime95 and monitored the fan speeds using SpeedFan. The fans used were a Scythe Kama 92mm PWM fan (maximum 2560 RPM) and a Scythe Kama Flow 80mm (maximum 1550 RPM).

Q-Fan Behavior
Critera
Silent
Optimal
Performance
CPU Fan
Trigger Temp.
67°C
62°C
54°C
Temp. Range
9°C
8°C
8°C
Fan Speed
Range
620 RPM to 2560 RPM
660 RPM to 2560 RPM
660 RPM to 2560 RPM
CHA Fan
Trigger Temp.
67°C
63°C
None
Temp. Range
1°C
1°C
N/A
Fan Speed
Range
1060 RPM to 1220 RPM
1200 RPM to 1340 RPM
1320 RPM

We found that once the trigger temperature is reached the CPU fan speed increases over a span of 8-9°C from between 600 and 2600 RPM no matter which setting was used. The only difference seemed to be the trigger temperature with "Performance" starting at 54°C, "Optimal" at 62°C and "Silent" at 67°C. The CHA fan speeds on the other hand varied very little. It should be noted that we actually had to turn the CPU cooling fan off before the CPU temperature got high enough to make the fans ramp up. Either our CPU was running especially cool, or the fan control just wasn't aggressive enough. We did not experience any instability due to overheating.



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