I have Sapphire Pulse RX 570 4GB Hynix/Elpida.
Using HiveOS with 1150 Core, 2200 Mem, 950mv, (rxboost 30, 55, 75, 100).
Tried everything, 10 different BIOS mods, I even made one click timing patch with Polaris, tried windows (compute mode) hashrate is 26.6 and that is it!
That happens on 4 same model cards, same settings. I bought them used. The guy that sold them said that he was getting around 30 mhs (before this new version of claymore) with that same BIOS.
Please someone help me.
Thanks!
Your 4GB Hynix ram can't handle 2200Mhz of memory clock, the max you can do with the 4GB is 2000Mhz and for many that leads to errors. Some of my 4GB can only run at 1950Mhz even.
Try 2000Mhz and it should be stable and you should get 28.75Mh/s or so. If you get any hardware errors or stability issues then you need to try either 1950 or 1900Mhz. You won't ever get stable at 2200Mhz using 4GB of memory. The 8GB were the only cards which can support memory clocks that high.