AMD's 785G Chipset Boards: 780G Evolved

CPUs|Motherboards
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Fan Control

To test the board's fan control, we connected the CPU fan to a manual fan speed controller so we could slow it down to induce higher CPU temperatures during load. A 92mm Scythe Kama PWM (2500 RPM) fan was connected to the CPU fan header and a 80mm Scythe Kama Flow (1500 RPM) fan was connected to the System fan header.

Fan Control
Asus M4A785TD-V EVO
Criterion
CPU Fan
(2500 RPM)
System Fan
(1500 RPM)
Min. Fan Speed
1220 RPM
720 RPM
Trigger Temp.
30°C
N/A (constant)
Max. Fan Speed Temp.
51°C
N/A (constant)
BIOS settings: 4.0V starting voltage, 30°C trigger temp., 51°C full speed temp.
MSI 785GM-E65
Criterion
CPU Fan
(2500 RPM)
System Fan
(1500 RPM)
Min. Fan Speed
200 RPM
630 RPM
Trigger Temp.
42°C
N/A (constant)
Max. Fan Speed Temp.
48°C
N/A (constant)
BIOS settings: 45°C trigger temp, 12.5% CPU min. fan speed, 50% SYS fan speed.

The Asus M4A785TD-V's fan control followed precisely the settings we entered in the BIOS. The fan ramp up was gradual, starting at 1220 RPM at 30°C core temperature and topping out at just over 2500 RPM at 51°C. By tweaking these settings you can make the fan control as aggressive or as passive as you like. On the downside, the CPU fan's minimum speed is a bit too high, and the secondary fan spun 50% speed throughout, not reacting to changes in temperature.

The MSI board had a much lower minimum CPU fan speed — it spun at only 200 RPM until the core temperature reached 42°C (3°C lower than the value entered in the BIOS), and ramped up very quickly, reaching its maximum speed a mere 6°C later. You can select when the CPU fan cranks up, but you can't dictate the speed at which it does so. The secondary fan spun at 630 RPM when set to 50% in the BIOS (75% and 100% are the other options). Like the Asus board, it does not respond to increased heat.

SpeedFan Support

For Windows users, SpeedFan is our application of choice for fan control. It can be configured to raise or lower multiple fan speeds to designated limits when any specified temperature threshold is breached.


SpeedFan correlations: Asus M4A785TD-V EVO.

SpeedFan reported fan speeds from all three headers as well as the "CPU" and "MB" temperatures indicated in Asus' PC Probe utility. SpeedFan can control the CPU_FAN header (only if a PWM fan is connected) and the CHA_FAN header. To enable fan control, select the "IT8712F-J" chip in the Advanced tab of the Configuration menu and set all the PWM modes to "Software Controlled."


SpeedFan main screen: MSI 785GM-E65.

Unfortunately SpeedFan does not yet support the sensors on the MSI 785GM-E65 — it could only report the hard drive and CPU core temperatures. SpeedFan also does not support fan speed readings or fan control of any kind. To make matters worse, the system monitoring and tweaking utilities offered on the support CD would not install.



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