ATTN: VOLTAGE SLIDER There are several posts in this thread where people are having trouble maintaining higher clocks or drawing higher power. In addition to actually overclocking the core, you need to (X1) increase the core voltage % slider to 100% or (Afterburner) *enable in settings* and increase core voltage slider to 100%. This will set the max vcore higher. On my 2080 Ti it has the following steps:
0% = 1.068v MAX
25% = 1.075v MAX
50% = 1.081v MAX
75% = 1.087v MAX
100% = 1.093v MAX
You can test this for yourself on the 3080 by applying a peak in the voltage-frequency graph (locking voltage), then seeing if it will hit that voltage as you adjust the slider. Typically you will get better stability at higher voltages, higher power will allow you to maintain higher voltages, thus allowing you to run higher clocks. You may need to lock in at higher voltages to be stable at high clocks. If you don't crank up this slider, you will never get the better results some people are posting (12.3K Port Royal and up).