[SOLVED] 3080 tachometer spikes for no apparent reason?

[Switch87]

Hello,

I have these weird tachometer spikes after leaving a gpu intensive app. It sounds like a revving bike, from 0 to 1300 rpm in less than a second in a couple of second intervals.

The only way to make it stop is to use the auto fan curve that shuts down the fans below 50º.

I have no idea what could cause it, I'll link a picture bellow showing the fan curve and all sort of GPU data.

This is taken while iddle on the desktop after exiting a game, you can see the rpm's down on the bottom part:

 

[Fix_that_Glitch]

On your custom fan curve you have two settings at the same exact speed for temperatures at 70c and 75c. It looks like it is jumping back and forth between those two. Try spreading out the speeds for those two temp settings. See if that helps.

 

[Switch87]

Sure, but this only happen at this temp (after exiting a game when the gpu is at around 45-50) not at the 70-75º mark

 

[Fix_that_Glitch]

Sure, but this only happen at this temp (after exiting a game when the gpu is at around 45-50) not at the 70-75º mark

So that I understand you, are you using a custom fan curve to control the fans? Because the one you have showing is not shutting down the fans below 50c. The speed never go's below 35 percent. AT 50-45c it shows dropping from 45 percent fan speed to 40 percent fan speed.

 

[Zerk2012]

Sure, but this only happen at this temp (after exiting a game when the gpu is at around 45-50) not at the 70-75º mark

From your fan curve you have 40C = 40% and 50C = 70%

 

[Switch87]

From your fan curve you have 40C = 40% and 50C = 70%

where are you seeing that? I believe at 50c I'm at 44% fan speed? Isn't X the temperature and Y the speed?

 

[Switch87]

So that I understand you, are you using a custom fan curve to control the fans? Because the one you have showing is not shutting down the fans below 50c. The speed never go's below 35 percent. AT 50-45c it shows dropping from 45 percent fan speed to 40 percent fan speed.

Yes that's the curve I'd like to use but for some odd reason at around 50c in idle it revs up and down unless I use the auto which turns them off bellow 50c

 

[Zerk2012]

where are you seeing that? I believe at 50c I'm at 44% fan speed? Isn't X the temperature and Y the speed?

Because you have that part of the curve way to aggressive.

Just set 2 points 50C = 20% 70C or 75C= 100%