From some benchmarking I have been doing it doesn't appear to be more than a few frames. I got 1.5fps in 3DMark and around 300 more points total for the GPU score. I am not hitting the power limit though as I raised it, and the clock never drops. But, maybe it just isn't worth OC'ing it. If only GPU prices would come back down. I bought this RX570 at the end of 2019 for around $100 new. Planed to have replaced it by now.My experience with Polaris would suggest to keep the undervolt, and ditch the OC. The card will offer better performance at stock clocks with the undervolt (especially if you can get away with a 100mV undervolt). The OC is not going to give you much of a boost over that because power limits get hit.