The case fans are rotating yet remain absent from system information.
The case fans are rotating yet remain absent from system information.
I completed my first PC after weeks of preparation, and everything functions except the case fans. I own four fans, all linked to a fanhub that connects to one system fan header instead of the PSU. Three fans operate correctly, while one is nonfunctional. I rearranged the ports on the fan hub without success, so I suspect one fan is faulty. The remaining three are active but not listed in the BIOS—only showing disabled system fans. Apart from the occasional nonworking fan, the others appear to be working, yet they’re missing from the BIOS list. On a related point, can I adjust fan curves without using the BIOS?
Placing three fans in a hub linked to one shared header on your motherboard works fine—it will appear as one fan. You can still manage them individually, though their speeds will match.
They're rotating, but nothing appears in the bios. What I notice is just my CPU fan, and it shows all others are off. Two are PWM fans, one isn't—could be the cause? Not sure.
I had a three-way splitter but only one connection had the sensor wire, while the others didn’t. It took me more than a year to figure it out. It turned out that if the motherboard can’t detect the system fans, it might still work—but not perfectly.
TL;DR, the setup varies by hub and configuration. It uses three wires, not a standard connector, and only reports RPMs from the sensor wire. The hub can’t distinguish between multiple fans or their speeds directly—it sends one RPM value per sensor wire. The fan controller details are unknown without more information.