Does your card have the latest MCU firmware?  (check using the latest version of EVGA Precision X1)
There was a MCU firmware update which was supposed to fix the fan 3 noise issues.
 
Otherwise, I can't be certain.  That might just be the way it is.
 
EDIT: I don't think the MCU firmware update was for that.  The MCU firmware update was to stop a whining noise from the fan.  The clicking noise?  I think that might just be the way that it is.

Same with my card. But it doesn't click. There is no way to notice fan 3 is doing anything weird. You have to go into the software and observe the wonky behavior.
afterburner and hwinfo do not show fan 3 percentage or rpm. It only shows fan 1 and 2. This tells me the 3rd fan is controlled in some odd way that may not be controlled directly.
And it might be this way for all cards, but people don't notice it unlike you who got unlucky and hear the wonky behavior.
 
You won't get help here. They will tell you to RMA.

This is still happening with the newest drivers, which I suppose isn't surprising.
I did contact EVGA and they offered an RMA - just not sure if it's worth the hassle given this issue seems somewhat common. I suspect that it's firmware-related rather than hardware.

I've had the revving issue for a while now: probably since I've gotten the card. I just recently started noticing the clicking sound however, as I don't think it was happening before. My setup has the fans at about 20ish% fan speed until 40C. I figure it might have to do with-as homestyle has said-fan 3 not being set up the same way as the other fans and 20% being somewhat of a minimum threshold for some PWM fans. I'm not an EE so don't quote me on that. I've had fan 3 set at about 23% until 40C for that reason: to keep it higher above the threshold than the other 2 fans. I think that helps somewhat but I've started getting the issue again so I'm not too sure.
 
I've found as a temporary fix sometimes taking my curves off and setting the fans to 33% manually and then reloading my profile allows the fan to slow down to the curve-specified speed. This works usually but it didn't when I had the issue earlier today. In fact, the fan was completely ignoring all settings so I ended up having to restart PX1 which fixed it.
 
I've had concurrent LED issues where the PX1 RGB settings will randomly reset to Rainbow Wave. Restarting PX1 is the only solution for this. Since PX1 seems to be fixing the issue many times I'm inclined to believe it's also the source of all the problems we're having.

This had me a little worried, as I anticipate the arrival of mine. So it was an LED thing ? Seriously ? 

same here on 3070 ti ftw3...

Same here. 3070 FTW3

Same here, 3070 ftw3 ultra.

I also get the clicking, which seems to be in conjunction with the fans getting activated again and again every about half a second when the card is sitting at a temp threshold.
And I also get the noisy fans, it's like a low rumble or vibration.

I would really like to keep the auto fan control as for some reason it never goes above 54% RPM in games while keeping GPU temp and hotspot temp LOWER than if I manually set the fans to higher RPM (still scratching my head over this one).

if i have a slight load on my 3080 ti ftw3 enough to heat it up to 60c fan 3 will goto 100rpm then turn off and repeat over and over and over again untill i force the fans on to cool it to like 40c. its annoying as hell as it vibrates everytime it starts from 0 rpm, so i hear it about every 5 seconds
 
I either got a defective fan controller for fan 3 or the chip needs a firmware update

rckrz6
I either got a defective fan controller for fan 3 or the chip needs a firmware update

It's "normal". It's by design and EVGA isn't listening. The 20xx series had the same annoying behavior.