I tried another BIOS (http://1stminingrig.com/best-bios-rom-sapphire-nitro-rx-580-8gb-oc-hynix-memory-30-mhs/) for my SAPPHIRE NITRO+ RADEON RX 580 8GB and get 28.1MH/s while pulling 158W (according to GPU-Z).
Any idea if that can still be optimized?
Yes, that's a custom timing set, probably leaked, but I'd give it a B minus.
Any idea what can be achieved with that GPU (Hynix Memory) when having an A+ BIOS? ;-)
I don't do work I would consider near flawless very often - takes WAY too much time. I highly doubt the Hynix memory you speak of (H5GQ8H24MJR) would exceed 33MH/s, at least not for me. Some people may be able to get (some really nice samples of it) there. I would estimate above 32MH/s, low to mid in that range, with a core clock way too high and using way too much power to do it. If you're going for max hash - no matter what - that is.
Do you mean that any rx card could reach over 33mhs?
Of course let's talk about stable values.
My friend bought bios from eliovp for his hynix 470 and his card reached much over 31mhs on some card, but on the other it only gave him less than 30. So. It dependa of asic and vram quality, too
I have some hynix with stock strap and I have only about 27mhs on it