I have the SAPPHIRE PULSE RX 580 8GB HYNIX.
I modded the bios copying the 0:1750 string to 0:2000 and 0:2250, this gives me 25,5 m/h, and 27 with core at 1100 mem at 2150 and vcore at -96 and powerlimit at +30. i found this
http://1stminingrig.com/best-bios-rom-for-sapphire-pulse-rx-580-8gb-oc-hynix-memory-30-mhs/ but my firmware is 256kb and has different timings, mine does not have 1:x og 2:x so i can't use it. Any suggestions to getting this to 30m/h?
These cards are strange. I've tried using 1500 straps and running them at 1250/1800 for 25.5mhs. The 1750 strap allow the mem to clocked at 2050+ but still give only 25.5mhs.
I've also tried playing with the powertune settings in the bios, rasing tdp/tdc/max powerlimit/small powerlimit with no effect on hashrate.
I have Rx 580 8GB Pulse hynix with costum strap i have 32mhs
1225/2250 0.83v
What's the part number of your cards? How big is bios 256kb or 512kb?