4080 Super Undervolt: what’s the sweet spot?

Hi everyone,
I’m looking to undervolt my RTX 4080 Super to reduce power consumption and temperatures without losing too much performance.

I’ve seen several users running undervolts around 2550–2750 MHz.
I tried 2700 MHz at 945 mV, but I experienced a crash in Crimson Desert, so that profile doesn’t seem to be stable for me.

I’m running a Ryzen 7 7700X and gaming at 4K.
My 4080S is an MSI Ventus.

What undervolt would you recommend as a starting point?

And what frequency/voltage are you running on your 4080 Super?

How do you usually test whether an undervolt is truly stable?
Thanks