My best advice is to spend your efforts elsewhere.
Graphics card vendors bin their chips and use the better ones in factory overclocked versions
that they can sell for more. You may be able to OC more, but then again, perhaps not.
They try to differentiate by adding cosmetics and fancy coolers which also sell for more.
I do think you get fair value from a modest factory overclocked card.
If you need more performance, then buy a higher tier card in the first place.