I thought I share this moded bios for this XFX model (http://www.xfxforce.com/en-us/products/amd-radeon-rx-400-series/rx-480-rs-4gb-dd-rx-480p4lfb6
Stable hashpower 29 MHS/ETH with 840 MHS/DCR stable. (-dcri 29)
Just flash with atiflash. If you use new drivers then use this patch (https://www.monitortests.com/forum/Thread-AMD-ATI-Pixel-Clock-Patcher
). If you don't want to use the patch then just use older amd drivers like 16.9.2. (http://support.amd.com/en-us/download/desktop/previous?os=Windows
10 - 64)
if you have questions feel free to ask.