I'd like to know this as well.
 
In my system the XC3 is very quiet, but seems to be at a cost of temps. It's regularly high 70's low 80's in games. Boost clock doesn't go higher than 1755Mhz (which I think is by design).
 
I'd like to get temps lower, say low 70's at most.
 
What custom fan profiles are you running? Also are you using EVGA Precision or MSI Afterburner to set them?
 
 

I’m just waiting for a fix for afterburner and the new drivers. Can’t get any custom curve to save. After trying precision x1 for a year, I really just prefer trusty old afterburner, but with the new driver, no custom curve will stick. 

I have a very aggressive custom curve. I have no idea what the engineers were thinking with the default fan curve on this card. It idles nearly 150F (65C) with the fans off. Absolutely ridiculous. With my custom fan curve it idles at 127F (52C) or lower. That is not an insignificant difference.

slapn

USALion
I have a very aggressive custom curve. I have no idea what the engineers were thinking with the default fan curve on this card. It idles nearly 150F (65C) with the fans off. Absolutely ridiculous. With my custom fan curve it idles at 127F (52C) or lower. That is not an insignificant difference.

i am at 27-30c  idle max 63-65c gaming @4k ///running a cm h500p mesh front /2  200mm fronts intake one 120 below front 200 so really good air flow under Gpu ,one rear exhaust 120 and 360 rad on top 3 exhaust

Is that with the XC3 or FTW3?

slapn
xc3 ultra 3080

You can get a 3080 XC3 to idle at 80 F (27 C)?? That's fantastic. My i7 idles that low even overclocked, but I have it on a water loop. My XC3 3080 has never been that cool. I think it was 120F (48 C) sitting in the packaging in air conditioning before install, no power. lmao. This is the hottest video card I have ever owned in my life.

USALion

slapn
xc3 ultra 3080

You can get a 3080 XC3 to idle at 80 F (27 C)?? That's fantastic. My i7 idles that low even overclocked, but I have it on a water loop. My XC3 3080 has never been that cool. I think it was 120F (48 C) sitting in the packaging in air conditioning before install, no power. lmao. This is the hottest video card I have ever owned in my life.

Lion pretty much same system from previous posts u have made. i7 8700k at 33c idle corsair 150 360/// i do see that that case is a bit low on fans and also i see you run max performance on global ,i would change that to adaptive and run on performance on the game tab per game   

xtreem.p
This is what i use... since i want to get the boost clocks...
 

this may be a stupid question but is this curve on all three fans?

Here's what I'm using and it seems to be pretty good for my setup. I'm running with a minimum of 25rpm because I don't like to hear the fans tick on and off. I can get idle temps as low as 26c when the system has been idle for a long time. Gaming usually stays below 72 C but I very occasionally go up as high as 77c. I'm using a Corsair 280x case which isn't super awesome airflow wise, but I have a couple 140mm fans blowing from the bottom of the case up into the 3080.
 

I've been using the following for the last few months keeping temps in the low 70s under load and 30s at idle. Not sure if it's best to have the fans spinning 24/7 or to just use the Default profile (which will have the fans automatically spin up at the 60c mark) I usually apply the overclock/fan profile just before I play games otherwise rock Default.

0-40c : 20%
50c : 50%
60c : 65%
65c : 70%
80c : 80%
90c : 100%
 
Case: Fractal Design Meshify S2 exhausting out the top/back.  Corsair H150i cooler in the front in push/pull with it's own fan profile that ramps up under load pushing more air towards the GPU and out the top/back.  Temp in the house is 65-70 degrees.