Those RX 470 cards just won't die. Finally able to tune for power efficiency and decent hash rate. Running eight of these bad boys in an eBay enclosure. Mining ETC of course. :
Mining Bios Mod up to 32Mh/s* AMD RX 460/470/480/550*/560/570/580/590 4GB/8GB | eBay
1 RX 470 Mining ETH at 57 Mh/s?? - YouTube
4GB AMD Radeon GPUs Can Still Mine Ethereum | The Crypto Blog
Best BIOS ROM for Sapphire RX 470 8GB Mining Edition with Samsung Memory 29 - 30 MH/s - 1st Mining Rig
RX 470 4GB Mining edition Raven bios - Willing to pay - AMD Cards - Forum and Knowledge Base A place where you can find answers to your questions | Hive OS
RX 470 4GB low hashrates across algorithms : r/gpumining