Most motherboard brands label system fans as chassis fans and use CHA_FAN labels instead of SYS_FAN. Typically labeled as SYS_FAN, these headers are used for powering (and controlling) system fans. Standard system fan headers, also known as case/chassis fan headers. Here are the four main types of PC fan connector labels you’ll find on your motherboard: SYS_FAN In your BIOS you’ll generally be able to then ramp that additional CPU FAN up and down based on your CPU’s temperature – if set up correctly.
Since CPU fans come with PWM, make sure you connect them to a 4-pin system fan header. If your CPU heatsink possesses more than one fan and your motherboard doesn’t have a CPU_OPT header, you’re free to use one of your SYS_FAN headers instead. However, without a single case fan, your airflow will suffer and you’re likely to experience thermal throttling, especially if you’re running a powerful rig. System Fan headers won’t throw an error on missing fans. That’s because motherboard manufacturers created safety measures to prevent CPUs from overheating, and if they detect that no fan has been connected to the CPU_FAN header, they’ll assume it’s missing and won’t allow you to boot.Īs for system fan headers, even if you have zero case fans installed, your PC won’t be bothered by that and boot just fine. The differences between system fan and CPU fan headers are subtle, but they do exist.įor starters, if you don’t plug your CPU fan into your motherboard’s CPU_FAN header, your system probably won’t even boot. Your Motherboard has CPU_FAN and SYS_FAN fan headers – but what’s the difference and which one should you use? System Fan vs.
You’re ready to plug in those Case or CPU fans but you’ve stumbled upon terminology you’re not all that familiar with? Where to Find System and CPU Fan Headers?.How Many Fan Headers does a Motherboard have?.Is CPU Fan Header the Same as System Fan Header?.
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