First you must keep one thing in mind, and that these are the structures not directly connected to the CPU_Fan connector on the motherboard; In other words, they intend to modify the functionality of the processor fan, or one you have connected to say the connector on the motherboard. So, no matter how much you change them, they will have no effect if you do not have the fan or fans of the processor heatsink connected to that link on the motherboard.
For some motherboards, in addition to having these components for the CPU_Fan connector, they also have Sys_Fan, another connector (or connectors) similar to the original but intended for box fans. In this case each type has its own configuration.
Steps and Step Down, what are they and how do they work?
Parameters Step-by-step can be found on most modern boards, in the Hardware monitor section, and are always connected to a time unit and, as we explained before, on motherboard connectors in concrete. by Q-Fan or Smart Fan.
You can see it on the left of the following picture.
In answer to the "what?" Question, both parameters are a unit of time measurement showing how long a motherboard should wait for it to reach a specified temperature threshold to start slowing down or increasing your speed.
Let us explain by example. At the human temperature in BIOS we set that 10% processor at 25 ° C, 30% at 40 ° C, 70% and 60 ° C, and set to 100% speed when the processor reaches 75 ° C ° C (as seen in the picture above). If we stay Go up in 0.7 seconds, the time it will take for the fan to start faster since the temperatures reached
Vice versa, Let go of the time it takes for the fan to start slowing down if the processor temperature limit is positive. Following the example, assume that the processor is set to 75 ° C and therefore the stock is at 100% speed. If the temperature drops below that temperature threshold and then Step Down is set for 1 second, the fan continues to rotate 100% at that time even if the temperature has dropped.
What are these structures designed for?
In fact, they work to keep fans from getting mad by constantly changing their pace. The temperature measured by the motherboard in the processor oscillates regularly, and if the response of the fan was not operating at a definite speed, it would make a lot of noise, reduce its useful life and in some cases cause turbulence due to variations in speed.
Setting the Step up and Step down parameter for to stabilize the performance of the fans, to constantly change your speed.