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Being a budget model, it's understandable that Gigabyte didn't put any advanced fan control features on the H77N-WIFI. However, even though control is offered on both fan headers, I only managed to get automatic control working on the CPU_FAN header. The BIOS/UEFI SYS_FAN setting was seemingly ignored and any fan connected to that header ran at full speed. Control of the CPU_FAN header also required a 4-pin PWM fan, so 3-pin fans also run at maximum.
Load test: CPU temperature vs. fan speeds.
Using SpeedFan to track the CPU temperature and fan speeds, I connected a 2000 RPM PWM fan to the CPU_FAN header and a 1300 RPM PWM fan to the SYS_FAN header, set both to "Silent" in the UEFI/BIOS (the same as 0.75 PWM value/°C) and put the system on full CPU load. The CPU_FAN behaved as expected, rising with the CPU temperature in a predictable manner while the SYS_FAN remained at full speed throughout.
EasyTune fan control menu.
Gigabyte's dated EasyTune utility does enable control of the second header
but once again, only PWM fans are supported and the slopes offered are all straight.
You get to choose two minimum/maximum fan speed and temperature points and the
fans ramp up linearly as they did in the load test.
SpeedFan screen with correlations inputted.
Like many times in the past, SpeedFan comes to the rescue. Both headers are fully controllable via PWM once the application is set up properly (find the "IT8728F" chip in the Advanced menu and change PWM 2-3 mode from "SmartGuardian" to "Software controlled"). The same CPU and System (chipset) temperature sensors found in EasyTune are also available, reported as the first "Temp2" and "Temp1" respectively.
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