Speedfan is a wonderful utility that’s absolutely free! It lets you keep track of your motherboard and CPU temperatures, your fan speeds, and the voltages from your power supply. You can even use it to automatically control your fan speeds. With a little tweaking, you can program Speedfan to spin your fans up and down according to temperature thresholds that you determine.
The upshot is this: You can keep your PC nice and quiet during low-impact tasks such as trolling the Maximum PC forums, but crank up the fans to keep your hardware cool when you’re playing a game or rendering video.
We’re going to show you how to configure Speedfan so that your CPU fan’s speed automatically adjusts in response to core temperature changes. Speedfan is definitely a power user’s app—it will do whatever you tell it to, even if that might potentially damage your hardware. Be careful!
While Speedfan supports dozens of motherboards, there are many models that don’t allow fan-speed changes. Some motherboards might not even display temperatures or fan speeds. Check the Speedfan homepage for a list of supported boards; if your board isn’t listed you’re probably out of luck.
1. Examining the Main Screen
The first time you fire up Speedfan, it takes readings from all of the sensors on the motherboard and gives each fan and temperature reading a cryptic label. In the left-hand pane, you’ll see the reported fan speeds for all of the fans Speedfan detects. Our Asus A8N32 motherboard sports five three-pin fan headers, but we’re only able to read fan-speed measurements for three of them.
In the right-side pane, you’ll see temperature readings from the sensors on your motherboard, as well as the sensor embedded in most CPUs. On our test system, Speedfan reported three temperatures: Temp1, Temp2, and Temp3. We figure that Temp1 is our CPU, Temp2 is the chipset, and we have no idea what Temp3 is, or why it’s running at -128 C. (We’ve seen this before in Speedfan—temperatures that are unbelievably low or high. According to the utility’s author, these erroneous temps are caused by a sensor that is present but not connected. In general, it’s wise to just ignore any reading that seems implausible.) Finally, we see HD0, which is the only hard drive in our rig. In the next step we’ll do some testing to verify which sensor is which.
Below the fan-speed readings are boxes labeled Speed01, Speed02, and Speed03. These usually correspond with the fan speeds listed right above them. You’ll also see voltage readings for the CPU core (Vcore), and for the various rails on your power supply. The power info can be very helpful if you need to troubleshoot a faulty PSU.
Now that you’re familiar with the main window, we’ll conduct some tests to determine which sensors and readouts correspond to particular fans and areas of the motherboard.
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