As the RTX 3080 Ti is a standard component, overclocking is possible for the Corsair One, and we used MSI afterburner. However, as we saw, memory temperatures are already quite high, so we opted to leave the GDDR6X at stock clocks.
Overclocking the GPU only then, we were able to add another 115MHz, which saw the operating frequency settle at around 1800MHz in our testing.
This overclock saw small performance improvements, typically in the region of 2-4%. It's something I guess, but it's not exactly much of a difference to gain an extra 2FPS.
Thermals were just fine when overclocked however, as only the hotspot temperature increase by 1C. The liquid cooler is clearly able to handle the increased clock speed.