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Can't set fan curve below 60% on Prime Z370 P fan headers

 
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post #1 of 8 (permalink) Old 03-29-2020, 07:00 AM - Thread Starter
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Can't set fan curve below 60% on Prime Z370 P fan headers

Posted here because it's an air cooled system.

Set up a new system on an Asus Prime Z370 P motherboard and for some reason Fan Expert will not allow DC fans to run below 60%,even when setup in bios. Only way to get rid of the noise was fan curve with fans turned off until temps reach set temp (I set it at 40c). I've ran fan setup curve, searched web, etc. and nothing. PWM (CPU fan header) does idle down just fine, but chassis fan headers with 3-pin stock Phanteks case fans with headers set to DC will not run any slower than 60%.

I have 2x fans on each chassis fan header with 2-way splitter. I ran setup tuning with two fans, then after not being able to idle them down I ran it with one fan. Still no joy. As this is not a computer I will be keeping I was hoping to setup fan curves with Asus fan software to make it easier for owner to change curves if they wanted.

Any ideas?

Phanteks Owners Club Ways to Better Cooling
i7 980 @ 3.55GHz =PH-TC14PE w/2x TY-143 fans =Crucial Ballistix 3x4GB =GA-X58A-UD5 =ASUS GTX580 DirectCU II =Enermax Modu84+ =Define R2 w/3x TY-140 case intake fans; all PWM controlled by CPU fan socketPhanteks Enthoo Primo MoBo Rampage III Extreme CPUi7 980X
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post #2 of 8 (permalink) Old 03-29-2020, 07:16 AM
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Fan Expert in the OS never worked great on my Z170-E, I had to do it in the BIOS. that was two years ago though.

SpeedFan not an option?

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post #3 of 8 (permalink) Old 03-29-2020, 07:45 AM
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Did you perform the fan tuning in either the AI Suite or in the BIOS?

That way the mainboard checks at what PWM strength/DC voltage your fans start to spin.

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post #4 of 8 (permalink) Old 03-29-2020, 07:47 AM
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Quote: Originally Posted by doyll View Post
Posted here because it's an air cooled system.

Set up a new system on an Asus Prime Z370 P motherboard and for some reason Fan Expert will not allow DC fans to run below 60%,even when setup in bios. Only way to get rid of the noise was fan curve with fans turned off until temps reach set temp (I set it at 40c). I've ran fan setup curve, searched web, etc. and nothing. PWM (CPU fan header) does idle down just fine, but chassis fan headers with 3-pin stock Phanteks case fans with headers set to DC will not run any slower than 60%.

I have 2x fans on each chassis fan header with 2-way splitter. I ran setup tuning with two fans, then after not being able to idle them down I ran it with one fan. Still no joy. As this is not a computer I will be keeping I was hoping to setup fan curves with Asus fan software to make it easier for owner to change curves if they wanted.

Any ideas?
Yup.
Dispose the board and get a MSI if you want decent fan control.

Asus software regarding fan control its an insult to trash.

Use low noise adapters. The only thing i can come up with.....
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post #5 of 8 (permalink) Old 03-29-2020, 08:03 AM
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Quote: Originally Posted by doyll View Post
chassis fan headers with 3-pin stock Phanteks case fans with headers set to DC will not run any slower than 60%.
That's really peculiar. All of my Asus boards have had issues with getting PWM right, but the DC controls were great from 0-100%. But, I haven't used any of their 370 series boards.

I just looked at the manual, and it shows that Min Duty Cycle on the fans can only be set to a value of 60-100%. That is freaking absurd.

If you have one of the Phanteks hubs laying around, switch the header to PWM and use that. That may solve the issue.....the issue that shouldn't have existed in the first place. 60% minimum????

Yeah....the little girl hentai avatar is really creeping me out....
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post #6 of 8 (permalink) Old 03-29-2020, 08:47 AM - Thread Starter
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Wow! Didn't expect so many quick replies!

Quote: Originally Posted by The Pook View Post
Fan Expert in the OS never worked great on my Z170-E, I had to do it in the BIOS. that was two years ago though.

SpeedFan not an option?
If it was for my own use SpeedFan would be fine, but for this person I'm trying to keep things as simple as possible.

In reality once I finish setting everything up I doubt owner will ever to anything beyone just using it. Probably won't even clean filters.


Quote: Originally Posted by mAs81 View Post
Did you perform the fan tuning in either the AI Suite or in the BIOS?

That way the mainboard checks at what PWM strength/DC voltage your fans start to spin.
Yes, both in windows and in BIOS.

Quote: Originally Posted by Shenhua View Post
Yup.
Dispose the board and get a MSI if you want decent fan control.

Asus software regarding fan control its an insult to trash.

Use low noise adapters. The only thing i can come up with.....
It's what they got for me to setup, so can't change things. If I had low-noise adaptors I would give them a try, but I don't


Quote: Originally Posted by ciarlatano View Post
That's really peculiar. All of my Asus boards have had issues with getting PWM right, but the DC controls were great from 0-100%. But, I haven't used any of their 370 series boards.

I just looked at the manual, and it shows that Min Duty Cycle on the fans can only be set to a value of 60-100%. That is freaking absurd.

If you have one of the Phanteks hubs laying around, switch the header to PWM and use that. That may solve the issue.....the issue that shouldn't have existed in the first place. 60% minimum????
I missed that in manual .. and searching online. Mobo software does set PWM below 60%. Cooler PWM fan is spinning very slow and silent.

I tried one Phanteks PWM hub with 2x fans with same results. I'm going to try it again with all 4 case fans on it and see if that gets speeds down. Only think I like about this board is fan stop. Expecting users to run fans at speed over 60% defies all logic. Forcing them to do so means I'll never buy another Asus motherboard.


Edit: Found below link, but when I tried it even in BIOS fan speed was still locked at >60%. Maybe I'll give it another try.

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i7 980 @ 3.55GHz =PH-TC14PE w/2x TY-143 fans =Crucial Ballistix 3x4GB =GA-X58A-UD5 =ASUS GTX580 DirectCU II =Enermax Modu84+ =Define R2 w/3x TY-140 case intake fans; all PWM controlled by CPU fan socketPhanteks Enthoo Primo MoBo Rampage III Extreme CPUi7 980X
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Last edited by doyll; 03-29-2020 at 08:51 AM.
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post #7 of 8 (permalink) Old 03-29-2020, 11:42 AM
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I have a z370 prime A. You need to run the fan tuning to set DC fans below 60% and PWM fans below 20%. The tuning part tries to figure out the minimum startup voltage for your fans and the bios will not allow you to set speeds below that (if you never ran the fan tuning it uses the default limit of 60% for DC and 20% for PWM). It does this by running the fans slower and slower and checking reported RPM. It's pretty annoying and unreliable. Also bios updates reset it. In your case I would try running it again, maybe even have the case opened up and "help" the fans to spin during the test cycle -- either by blowing air in to them or by hand. After each "tuning" check the what is the new min duty cycle it will allow you to set. I usually run it 2-3 times until I get the numbers I know are possible. Since this is for someone else, who will probably not update their bios on their own, it should be safe, as the settings are remembered (unless you reset the bios or update it). Also the "pump" fan header has different limits for some reason so try not to use it for fans if possible.


EDIT

I also vaguely remember that it resets if it detects fan configuration changes (like plugging to different headers). Also make sure that the board is getting real RPM values from fans (splitters and hubs can break this) and the tuning settings are per header, so all used headers need to get good rpm readings for tuning to work.

Last edited by tincmulc; 03-29-2020 at 11:51 AM.
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post #8 of 8 (permalink) Old 03-30-2020, 08:22 AM - Thread Starter
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Quote: Originally Posted by tincmulc View Post
I have a z370 prime A. You need to run the fan tuning to set DC fans below 60% and PWM fans below 20%. The tuning part tries to figure out the minimum startup voltage for your fans and the bios will not allow you to set speeds below that (if you never ran the fan tuning it uses the default limit of 60% for DC and 20% for PWM). It does this by running the fans slower and slower and checking reported RPM. It's pretty annoying and unreliable. Also bios updates reset it. In your case I would try running it again, maybe even have the case opened up and "help" the fans to spin during the test cycle -- either by blowing air in to them or by hand. After each "tuning" check the what is the new min duty cycle it will allow you to set. I usually run it 2-3 times until I get the numbers I know are possible. Since this is for someone else, who will probably not update their bios on their own, it should be safe, as the settings are remembered (unless you reset the bios or update it). Also the "pump" fan header has different limits for some reason so try not to use it for fans if possible.


EDIT

I also vaguely remember that it resets if it detects fan configuration changes (like plugging to different headers). Also make sure that the board is getting real RPM values from fans (splitters and hubs can break this) and the tuning settings are per header, so all used headers need to get good rpm readings for tuning to work.

I've ran the fan setup several times with different fans plugged to different headers. I can only get PWM will idle below 60%. I ended up running a custom built PWM controlled 3-pin variable voltage fan hub on PWM and now have lower idle speeds. Still need to do some more fine tuning. I sure hope the saved setting don't get lost with a fan change. I won't be getting another Asus mobo, that's for sure unless they change this idiotic 60% fan speed minimum carp.



Thanks all for your help.

Phanteks Owners Club Ways to Better Cooling
i7 980 @ 3.55GHz =PH-TC14PE w/2x TY-143 fans =Crucial Ballistix 3x4GB =GA-X58A-UD5 =ASUS GTX580 DirectCU II =Enermax Modu84+ =Define R2 w/3x TY-140 case intake fans; all PWM controlled by CPU fan socketPhanteks Enthoo Primo MoBo Rampage III Extreme CPUi7 980X
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