Are there any modded bioses for the RX 570?
I find much for the 470's (https://anorak.tech/t/anoraks-vbios-collection-optimized-settings-for-performance-power-saving/13/3)
As everyone is saying. Mod your BIOS yourself.
At least copy the straps and if you are able customise them, but do not use a pre-built one.
You risk to brick your cards just because you are to lazy to spend 2 minutes opening Polaris Bios Editor?
golden words. listen to this guy. it also obvious, that most of the Brands have their own bios with their own settings. so do it yourself, it is not that complicated. modification of the straps is complicated but can also be done on your own after some deepdiving into the matter.
i would definitely go with with Rx4xx series if you get them cheap. those are proven and tested cards with lots of know how available