I'm having a ton of difficulty getting my 2080 Ti and EVGA Precision X1 to actually respect my fan curves. I need to run a custom fan curve, because I need the fans to run at 20% duty when idle to prevent the annoying fan start/stop clicking issues.
 
I can verify my fan curve is respected until temperatures hit ~85C. Even though I have the fan curve set to a specific RPM, at ~85C the fans surge to maximum RPM and then immediately back off. It's super distracting and it happens frequently. Without a custom fan curve set, this issue doesn't happen and my load RPM stays well below maximum RPM while temperatures hover around ~85C. 
 
Setup -
* Windows 10 October Update
* Geforce Game Ready Driver Version 417.22
* 2080 Ti XC Ultra
* EVGA Precision X1 v0.3.9.0 BETA
 
Things I've tried -
* Reinstalling X1.
* Clearing settings and profiles.
* I've tried both MCU 0x73 ("fan speed" issue MCU) and 0x75 (comes with latest LED Sync) to no avail.
* This is my SECOND 2080 Ti (RMA'd the first due to fan and coil whine noise).
* Both "extreme" fan curves (e.g., force to 20% or 80% duty constant) and "gentle" fan curves (e.g., gradually ramp to 100%) to no avail.
* Playing with Temperature Hysteresis.
 
Any thoughts? Is anyone else experiencing this issue? Thanks!
 

@  xSDMx



I'm not positive but that 85 C could be the Max temp & automatically goes to 100% fan ----> at 85 C I'd want 100% fan


You mention "constant fans clicking" because --> Fans are starting & stopping frequently - there are some adjustments in software:
 

Temperature Hysteresis: will make the system wait till the "set number" in degrees C, has been passed before the fan will slow
(example)  If fans go 100% at 85 C & hysteresis is set to 5 --> the temp must drop below 80 C for fans to go back below 100%

Fan Speed Update Period: is the number of seconds between the info being updated  1 second = 1000 ms
 
And of course set the minimum fan speed above zero   (I run mine at 30% all the time, custom curve to higher speed as temps climb)
 

It's not an issue if I use the default fan management or set a fixed speed. It's only an issue at 85C if I use a custom curve.

My issue is that my fan curve is being overridden and is not respected. Different people have different setups and needs, I'm happy your setup doesn't surface these issues.

I'd say try the same curve with MSI Afterburner, if the same issue persists it's likely hardcoded into the fan logic to go max at that temp. You really shouldn't be running the fan at 50% from 70-90C, that's not enough cooling especially with whatever hot box you've got this thing in keeping it 52 C at idle.
You need better airflow.