I recently purchased five Arctic P12 Pro PST fans to use in my PC case, along with an Arctic case fan hub. However, every time I connect them, they all start spinning at full speed without any variation. I've tried several configurations: connecting one fan to the hub, connecting all five to one hub slot, and even splitting them between two slots, but they always run at maximum speed. I also attempted to configure settings in the BIOS and used a fan control app, but the app didn't even detect the fans. Interestingly, when I connect a single fan directly to the motherboard, it works fine at varying speeds, but when that same fan is connected to the hub, it again runs at full speed. My motherboard is a Gigabyte H110m-s2 with BIOS version F27b. I noticed that the Smart Fan 5 interface looks different from what I've found online, as mine only shows options for fan presets (silent, normal, max, manual), and the manual only discusses fan power in relation to temperature. Any insights would be appreciated!
2 Answers
First off, check if your fans are DC (3-pin) or PWM (4-pin). If they're PWM fans, make sure that the hub you're using is also a PWM hub. In order for your motherboard to control the speeds of the fans connected to a hub, there needs to be a wire going from the hub to a fan header on the motherboard. This connection allows the PWM signal to manage the fan speeds. If the hub doesn't have a dedicated connection to the motherboard, then it will just run the fans at full speed all the time.
Yeah, it sounds like your hub isn’t set up correctly for the fans to be controlled. Make sure you're connecting the hub to the motherboard correctly—look for a connection that carries the PWM signal. If it’s only using a couple of pins, that might be why they're not responding to speed adjustments. You might want to check the manual for your fan hub to see how it should be wired up.
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