If you only have a two-fan cooler, for example, you can just use CPU_FAN for one fan and CPU_OPT for the other. If you want to connect fans from your CPU cooler or radiator, use the CPU_FAN header (With a splitter/hub if you have a lot of fans). Let’s rejoice that the days of plugging in 20 different things to one or two headers are thankfully over.
So you’re free to tinker with them and increase or decrease them according to your GPU thermals, CPU thermals, Case thermals, or whatever you wish.Īnd there are a wide variety of such headers on modern motherboards-mostly focused on helping water cooling. They’re like CPU_OPT but not necessarily connected to the thermals of the CPU.
These are the headers you connect your case fans to and are meant for differentiating fan control. I’m sure you’ve already figured it out from the name. Here’s how.Īnd while we’re at it, we might as well address these as well: Properly connecting AIOs (All-in-one liquid CPU coolers) deserves an article in itself, though, as this process does differ quite a bit from connecting your Air Cooler. Most AIO/liquid cooling solutions can also use it as a power source for water-cooling pumps and other things that might require power but is not important or power-hungry enough to reroute power directly from the power supply.
What is CPU OPT (CPU_OPT)?ĬPU_OPT, standing for “CPU Optional”, is mainly used when you have more than one fan on your cooler/radiator, and you need someplace to plug it in.Įssentially it’s CPU_FAN without the “not booting if nothing is connected to it” part. You must make sure to plug your CPU cooler fan into this header, as most motherboards worth their name would not allow you to boot your system otherwise.Īlso, if the system is already running somehow, a misread of this CPU FAN header will safely shut your system down if it detects that the CPU has no cooler or that the fans are defective and/or not spinning (when they are supposed to). Which one do you choose? CPU_FAN or CPU_OPT? What is CPU FAN (CPU_FAN)?ĬPU_FAN, standing for “CPU Fan”, is the main header used by the motherboard, the BIOS, or any fan-software (SpeedFan, HWMonitor, NZXT CAM, etc), to influence the CPU’s thermals by controlling the fan speed.
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