ASUS ROG Maximus XII "High Amp" features a fan header designed for high-current demands.
ASUS ROG Maximus XII "High Amp" features a fan header designed for high-current demands.
Not every PWM fan halts at 0%, a few continue operating at reduced speeds. This pattern can be adjusted by designers since the fan always receives full 12V power.
The control refers to PWM cycle timing. A 23% value indicates the extra pin receives power 23% of the time, similar to adjusting a throttle. It doesn't relate to speed reading or acceleration. Speed reading and PWM cycles are unrelated concepts.
Are you interpreting this correctly? If the PWM cycle is set at 20%, it shouldn't affect power or voltage directly, only the timing for turning the fan on and off. This means using a 0.1Amp or 3Amp fan should work for speed control, no matter the setting. As shown in the diagram above, it’s marked to stop completely at its current temperature, yet it continues almost fully.
For basic PWM fans, yes. Some are set to operate at 30% speed with 0% PWM. They use a specific chip instead of just a switch. I don’t know how your fan functions, so this is just an assumption. Now that’s a concern. Is the BIOS utilizing that header in PWM mode (instead of DC mode)? Are you employing a splitter that doesn’t divide the PWM pin?
I'm checking if the reading from the fan using the 4th pin on the 3-way splitter isn't working properly, which might cause it to run at full speed all the time. Some sources suggest fans should operate at maximum speed when the control signal is absent. It seems like a possible solution would be to rotate the connections so another fan takes over as the controller.
Even remove the splitters and test each fan separately. The difference in speed should be noticeable, not just what the software says.
It was almost simple... I switched the fan with the 4th pin and it functioned immediately. The PC is almost quiet now.