Originally Posted by Astral85
Things are quite different with the 2080 Ti, they run hotter than the 1080 Ti... But you are right the difference between summer and winter temps at the components is about 5C.
Yes, I know. The 2080TI uses a lot more power than the 1080TI. Undervolting should help quite a bit on this.
I can run my 1080TI at 925mV at about 2000mhz. This lowers power consumption to about 60-70% TDP while gaming. If I overclock it to the max, I'm only achieving 2088mhz at 1093mV and then I'm constantly hitting the power limiter of 117% (I have mine always maxed out).
Lowering the voltage lowers the delta between the GPU core and water temp by about 2°C. And because my GPU isn't dumping that much heat into the loop, the water temps also drop by 2°C.
I like the manual undervolt better than lowering the powerlimit because it gives better clocks for the same voltage. And the core frequency never dips because the powerlimit is never exceed. My mate tried this on his 2080TI and the effect of this was even bigger than on my 1080TI.
And the difference between 2000mhz and 2088mhz, is about 3 fps in Assassins Creed Odyssey on 1440p. I dropped from 87fps to 84fps while I was switching profile in Afterburner when standing still. No the impact is not that big. Something worth trying if you like to mess around with After Burner.
But still, even if you go for the max OC, it shouldn't be an issue on water. These cards run at 80°C without any issues when being aircooled. So worst case you hit 55°C on a 2080TI in summer.