lolMiner 0.7 alpha 4 and alpha 3 - unstable for me. rx470 4gb hynix (moded straps, 1167cc/1800mc, 930mV).
Most stable is alpha 2.
I have the same rig 6x470 4 gb hynix Saphirre Nitro , for me working fine, straps modded for ether 1145 cc/1750 mc/875 mV with Overdrivetool and only 680 Watt ))