Has anyone used a Visiontek 570? I just got a hold of them and am about to setup my rig. I'm a bit hesitant to keep them though because hardly anyone talks about Visiontek cards..
I have 2 of these cards, they one gets 22mhs and the other gets 24 with stock settings. They both have elpida memory.
I found a modded bios at
http://1stminingrig.com/are-the-rx570-and-rx580-profitable-mining-performance-review/ a member named dragoon posted a modded bios, increased my hashrate to 26 and 27mhs for eth. Anorak.tech has some visiontek roms as well.