Control case fan speed6/29/2023 two or more 4-pin headers for case fans.sometimes a couple of more 2-pin headers that are not controlled and will always run the fan at top speed.two 3-pin headers to support two case fans that are less precisely controlled, with only a low/med/high setting.a 4-pin header for the CPU fan, and the mobo will change the CPU fan speed depending on the CPU temperature.Some cheaper mobos include 2-pin fan headers for extra case fans, but can't actually control them. 4-pin fans control the speed a different way, using that fourth pin to send a square wave. You only need a fan controller if you're trying to do something fancy.ΔΆ-pin and 3-pin fans are controlled by changing the voltage, and the difference is 3-pin fans also send a signal from the fan so that the mobo can measure the speed. You can install a free software that will talk to the mobo and monitor/control fan speed even after you've booted into the OS. You can change fan profiles in the BIOS if you want the fans to run faster or slower than the default. Most mobos support some level of fan control. Pick, Assemble and Install: Video Guide.No intentionally harmful, misleading or joke advice.No excessive posting (more than one submission in 24 hours).No selling, trading or requests for valuation.No self-promotion, advertising, begging, or surveys.No submissions about memes, jokes, meta, or hypothetical / dream builds.No titles that are all-caps, clickbait, PSAs, pro-tips or contain emoji.No submissions about retailer or customer service experiences.No submissions about sales, deals or unauthorized giveaways.No submissions about hardware news, rumors, or reviews.Please keep in mind that we are here to help you build a computer, not to build it for you. ![]() Submit Build Help/Ready post Submit Troubleshooting post Submit other post New Here? BuildAPC Beginner's Guide Live Chat on Discord Daily Simple Questions threads
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