Overclocking can yield varied results based on a lot of factors. One of which is commonly known as silicon lottery. Like all baked goods, processor silicon has various imperfections and inconsistencies that can allow less OC. Some chips are nerfed at the factory because they will re-release it later at a faster speed, etc. OC is kind of like gambling, and I think that's why it's popular.
My ryzen is a "silver" which is basically not gonna do squat in OC. The 3080 i have is "factory oc" which basically just means its silicon with less imperfections that they can guarantee runs at a certain frequency. Most current high end GPUs will power or heat throttle before they reach peak frequency anyhow. That's why pretty much all the OC records are done by people cooling with liquid Nitrogen. lol
All higher end cards are going to boost to around the same mhz, regardless of how fast the base clock is set at. Changing VRAM speeds and increasing the voltage cap can probably get me 5-10fps, but i don't really care that much.
I think we are past the days where OC can unlock 20% more performance, but people still remember such things being possible.