I bought 5 each of Gigabyte Gaming 580 8gb, Gigabyte Aorus 580 8gb, and Msi 580 Armor 8gb. The Armor cards are absolute junk and I'm sending them back. Modded one of each card and got both Giga versions up to 29mh/s stable, Msi would never go over 26mh/s but mostly stays at 24mh/s and the mod and/or changing core/clocks only makes things worse. TBH I'm thinking about sending all the cards back and waiting on Vega. If these cards had done ~30mh/s they would have almost paid for themselves by the time Vega releases. MSI Armors are going back for sure! Total garbage. Cheap construction, no backplates, just nothing good to say about them.