I found that Linux is not very stable with my rigs when mining with claymore dual miner, I finally run all of them under Windows 7 without any issue for days.
The 570 cards work great. I am now painstakenly starting over from scratch editing the BIOS via ATIFLASH on linux (still using polaris on windows to make the changes) - but I think Windows has something in it that overrides the BIOS when necessary and allows it to run more stable. But I really want Linux, so hopefully will find what BIOS setting is getting over-ridden. So much fun copying files back and forth over SCP and changing one small element at a time.