Put my non-xtreme card in my rig just now.
Done a bit of messing around in "Aorus engine", another horrible piece of Gigabyte software to contend with.
Somewhat randomly slapped the boost clock to 1810MHz and the memory to the same as the Xtreme version (14,140MHz) and manual fan control at 90%, probs too loud for many. This achieves 2,070 MHz on the core when a game starts, which obviously drops when the card heats up.
After the temps seem to stabilise in Shadow of the Tomb Raider, 4K, Highest Preset, uncapped framerate (get about 55-65 in the area I've been testing) the temps are around 72C and the core clock is 1,995 MHz with my case door open...
As I've mounted the card vertically in my Phanteks Evolv X using the built in mount, there is probably less than an inch of space between the fans and the glass, obviously not ideal, and the temps shoot up by 12C to 84C and core clock drops to between 1965-1980 MHz.
I'm gonna put everything to stock and also run a "OC Scanner" utility to see what happens.