This thing is amazing! It crushes everything I play!  Just a few issues, though... With G-Sync it will go higher than my refresh rate and cause tearing. Is there any way to fix that?  The in-game frame limiter limits those parts to 120Hz but it still has tearing.  Horizon Zero Dawn generally runs around 90fps but some parts apparently get chewed up by the 3080 Ti and turbo spit out.. Never happened with the 3070 because apparently 8GB isn't enough for it, and it would choke. The game seems to want 10GB.  The 3080 Ti just inhales it. (I know. First World Problem.)
 
Another issue is that the card runs hot.. Normal mode seems to keep the fan speed to hold it to 80c max.. The 3070 seemed to hold the temp to 65c max.. Is that normal, or too hot?
 
It's also cooking my NVMe drive, or at least making it about 15c warmer than I've never seen it. Is 60c bad for NVMe?  If so motherboard design is crap, since where they put the main one is always between the two hottest components.
 
I'm loving this thing!  Holy crud is it a monster!
 
Oh, and should I try undervolting it?  Is that bad for the card, or extra good for it?

You have to set up each game in the nvidia control center - manage 3d settings - program settings- find your game and set up the params. Best thing to do is let the NVCC control all the game settings you can like AA, AF, etc... cause if you turn it on there and in game they will hamper each other and the best thing to do is let the gpu driver run the show. Set the max frame rate, not background max frame rate but you can set that one to 30 if you want, to 2 or 3 frames under what you want to run gsync at and it will run smoother. Power management in the NVCC should be max performance, preferred refresh rate-highest available and thats about the most important ones. Do not install geforce experience and all the telemetry/update garbage, if you have DDU uninstall the gpu drivers and use nvcleanstall and do them correctly, then restart rig. https://www.techpowerup.com/nvcleanstall/   and DDU: https://www.wagnardsoft.com/content/display-driver-uninstaller-ddu-v18052-released  
 The temps can be controlled with preferably Afterburner and setting up performance profiles, but you can use evga's precision program if you want. You gotta crank up the fans on it before you play games, but ambients, your case, what fans you have there, what gpu you have, re-TIM and lapping heatsink etc... will all make a difference one way or the other.
NVME's sitting at 60c doing work is not good, but ironically the mems dont mind it so much and will do better a little warm but the controller will die with high heat.
 Undervolting wont hurt the card at all but it probably will introduce instability at some point the older it gets the more you use it etc... Although with high heat numbers you may see it right away, but it def wont hurt the card just crash you or lock rig. Glad your enjoying it though!

I got an undervolt that, under Doom RTX, reduced the temp 8c and power draw 55 watts, and still runs great. I used that since it seems to really pound the GPU. I'll run some heavy benchmark stress testing too, see if it's stable.
 
As for the g-sync with v-sync, setting v-sync to Fast seemed to help a lot.
 
I think I had some of this stuff set right before, but I did a driver wipe and clean install to prevent driver issues.. Now trying to get everything set back right.

Congratz on your 3080 Have fun Gaming

which 3080 Ti ?
 
This can help - you need to test ... your undervolt may negate any benefit
 
In GPU OC setting Set the Voltage slider to 95% & Power Slider to Max
 
In my testing Performance did not suffer @ 95% V & Temps dropped nicely from 100%V
 
 
---> Max your case fans, need to get the heat Out before the cooler recycles the heat
---> Room temp ?