SpeedFan: A Guide to Universal Motherboard Fan Control

Cooling | Fans|Controls
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The Configuration Process (Continued)

One of SpeedFan's most under-used features is its charting ability. In the "Chart" tab, you can pit the various sensors against one another, seeing how they change over time. We graphed the temperature sensors that were puzzling us, including "System" which correlated to what PC Probe's identified as the "Motherboard" sensor (we wanted to know exactly where "Motherboard" was located). After going through the first few steps of configuration, we also noticed that all the "SMIOVT" sensors reported the same value, so we decided to discard two of them for being redundant.

When identifying temperature sensors manually, it's helpful to heat the system up first so that differences can be more easily observed. We ran Prime95 for about 15 minutes until the temperatures stabilized, then placed a fan over different portions of the board to see if any of the sensors would react. "System" and "SMIOVT4" dipped a similar amount when the fan was cooling the PCH heatsink. "SMIOVT4" seemed to be more erratic so we decided it would be disabled in favor of "System". Moving the same fan over the RAM caused "AUX" to drop, so it appears there's a sensor near the DIMM slots which is a nice bonus.

We also noticed that the "CPU" reading in PC Probe was always within one degree of "Core 0" (Core 0 and 1 are sensors generated by the processor itself), so all the fan, speed, and temperature sensors are now sorted out. We'll switch our focus to setting up automatic fan control using custom parameters. Check the "Automatic fan speed" box and go back into the Configuration menu.

The sensors in the Temperature tab are expandable, allowing you to pick and choose which fans will react to them. Above we've set the CPU fan to respond to the CPU temperature, the GPU fan to the GPU temperature, and the Chassis fans to the hard drive temperature. The fans in question will speed up whenever the "Desired" temperature is exceeded and at the "Warning" temperature, it will override your settings and run the fan at 100% to ensure overheating doesn't occur. If you click the "Show in tray" box at bottom right, that temperature reading will be displayed on the SpeedFan icon in the system tray.

In the Fan tab, set the desired minimum and maximum values for each fan, and check the "Automatically variated" box.

In the graphs above, you can see SpeedFan in action. Prime95 is run and the CPU temperature spikes. Shortly after, the CPU fan speed starts to ramp up (note: the fan speed graph was created a few seconds after the temperature graph, so it's shifted toward the right, making the reaction time seem a little slow).



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