please fix mistake in subject "PhoenixMiner 5.1c: fastest Ethereum/Ethash miner with lowest devfee (Win/Linux)". You have to delete word "Linux" at the end.
Let me say it again ...
I m currently running it, 5.1c on linux with amd 570 4gb cards mining eth.
It works just fine. Ive also got several rigs on 5.0e.
The software works.