I just referenced a few oc'ing guides from youtube. Obviously, your milage will very. Mine needs alot of voltage to reach anything worth while. der8auer has a good video but he always has prime examples.
Dount you would even need to overclock it to run with a 2080s.
Run mine around 4.6 as doing any more wont yeild much and then its really hot. Gaming it sites around 65c on a custom loop and 80c rendering. Holding back this 3090 a bit on 1440 bit cod is poorly optimized with all its updates and settings anyway.