DFI LanParty JR 790GX-M3H5 mATX Motherboard

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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 Scythe DFS922512M-PWM (200 to 2500 RPM) fan was connected to the CPU fan header. In the BIOS, "CPU Fan Turn Off" was set to 25C, "CPU Fan Fully On" to 50C and "Shutdown Temperature" to 80C.

When the CPU temperature was in between the Off/Full On temperatures, the CPU fan speed stayed fairly slow — it increased from 200 RPM at 25°C to only 600 RPM at 50°C. Once the "Fully On" temperature was reached, the fan speed increased almost linearly with the CPU temperature, but did not hit the fan's maximum speed until 75°C. At 78°C, the system shutdown. If anything we would say the board's fan control reacts too slowly as it did not reach maximum speed until the Shutdown temperature was almost reached. The "Fully On" setting acts as the trigger temperature and we suggest you set this fairly low.

Also it should be noted that the each fan header is tied to a different temperature. Of the two auxiliary fans that can be controlled, one is tied to the System temperature, while the other reacts to the Chipset temperature.

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 with correlations entered.

SpeedFan reported the fan speeds of three of the six onboard fan headers as well as the CPU, System and Chipset temperatures (correlated to DFI's Smart Guardian utility). Through thermal testing we concluded that the System and Chipset temperatures refer to the Northbridge and Southbridge. One of the temperature sensors could not be identified — it stayed between 24C and 26C throughout testing.

SpeedFan can control the CPU fan header (only if a PWM fan is connected) and the System and 3rd fan headers which are the two at the very bottom of the board, close to the onboard power/reset switches. To enable full fan control, select the "IT8712F-J" chip in the Advanced tab of the Configuration menu and set all the PWM modes to "Software Controlled."

Smart Guardian


Smart Guardian: Main display.

DFI's Smart Guardian utility provides extra information including detailed voltage readings.


Smart Guardian: Option menu.

Smart Guardian also lets you tweak the board's automatic fan control to suit your inidividual preferences.



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