Sorry but why we should increase core on RTX 3080 so much?
1050-1080 range is more than enough to keep stability.
Anything more is just a waste of power.
I made a test on my cards and passing from 1050 to 1500, wattage moved from 215W to 240W each.
im setting 1200 on my 3080, 3080ti and 3090. memclock varies though. it is the sweet spot for me.