AsRock z170 pro4 fan hysteresis

Nimbus wrote: Don't know where to post. That is a feature request. Have found that temps may increase up to +10..+18 degrees for a very short period of time (less than 1-3 seconds) and fans increase speeds to audible level because of that. Fan hysteresis control in Fan Speed Tuning (Fantastic Tuning) will be very helpful to solve that issues. If it is possible, add that option in appropriate BIOS category, please. *Fan hysteresis, I mean, delay between temp increase vs fan speed to make fans not react to short term temperature peaks. Maybe 0 (disabled or like now) to 5 seconds with increments 0.1s or smth. That will be very helpful when overclock with disabled power saving features (constant volatge and frequency).

You can post this request in this sub-forum, that's fine.

I understand what you mean by hysteresis. A hysteresis is a delay of a reaction triggered by another reaction. You described it perfectly.

The first reaction is the increase in CPU/core temperature, which causes another reaction, an increase in fan speed. You are requesting the ability to delay the increase in fan speed when the CPU temperature increases, to prevent "pumping" of the fan's speed, which is audible.

Of course, that capability does not now exist in any ASRock fan speed control. I'm not aware if another mother board manufacture has that capability with their fan speed control.

Just for my information, are you referring to all fan headers? Or any that can monitor the CPU temperature?

One workaround you could try, is if you know the general range of the short term temperature increases, say 10 to 20 degrees, in the range of say 30°C to 50°C, then simply set the next increase in fan speed above 30°C to 55°C.

The fans you use also are a factor in this situation. The increase in the audibility of a fan with speed is not equivalent for all fans. All fans have different starting voltages (minimum applied voltage to cause them to begin spinning), their speed vs applied voltage is not the same, and their increase in speed for a delta in applied voltage is not the same, or linear. I know changing fans costs money, and your feature would be free (but built into the price of a board), so not much help if you don't want to change fans.

If I may ask you about the Z170 Pro4's fan speed control, we have seen a few post here lately that claim the two Chassis fan headers, or just the Chassis Fan2 header, don't have any fan speed control working with them at all. The fans are said to run at 100% speed all the time on both of those headers, or just on Chassis Fan2.

Do you find that to be true with your board, and the fans you use?

Thanks for the information about the fan headers, that does help me understand how your board works. It does seem that the Chassis Fan2 header is not being controlled as it should be, given the specs for the board.

Intel processors change their temperatures very quickly, both up and down, as you've seen. Maybe a little faster temperature change than AMD, which might be what you usually had with your 890FX board.

I don't think you will get your fan speed hysteresis feature, sorry to say. I like the idea but it could be complicated once you design how it should work.

I don't use this software, but there is a fan speed control software called SpeedFan, that allows very complex control of fans connected to a mother board. You would need to check if it even supports your board, or really the fan speed and temperature sensor chip used by your board. That chip is the NuvoTon chip, the large square chip to the left of the board's battery. You would need the model number of that chip. My ASRock Z170 board uses a NuvoTon NCT6791D chip, but I don't know which chip your board has.

Hi, first of all I apologize for my english, I read that you are talking about speed of fans on your asrock motherboards and I'm about to buy an ASRock H170 Pro4S and it seems it has the same fans headers you have in yours: 3 x chassis fans (2 x 4-pin, 1 x 3-pin).
I would like to know if it's possible with fan-tastic to set a range of low temperature where the fans don't spin at all, just like another brand of motherboard can in "silent mode".
Regards.

Thank you Nimbus, indeed that was the answer I was looking for , if you are interested in cpu fan that are capable to stop spinning in low pwm, I'm about to buy one. In fact I'm building a "complete semi-passive" pc, thus a pc that in idle dosen't have any part that moves (I don't know if that makes sense).
The way you are able to make the fans stop spinning is via fan-tastic? I mean is via a thermoregulated curve? That is important to me! Because once the temperature raise, they have to start spinning again at the right rate.
Let me know please.

I just saw the video, interesting...  thanks again Nimbus