Some new straps for polaris 20 cads ?
old straps can't exceeds 30 for new batches or maybe it is drivers issues ?
I returns 12 x Gigabyte RX 580 Gaming 8G because I can't exceeds good Hashrate
What memory? H5GC8H24MJ?
Samsung I don't remember but I try every straps that I have
And hashrate was 25-26
Well without exact type can't really help you. But even those mining cards RX 470 with sh*tty Samsung (FC type I think) I could get to at least 29MH/s... Even those lowest perform Samsungs do 28MH/s with classic Uber-mixes.