The 2nd-hand R4 control board has complete components and can be employed Usually immediately after getting the goods. Welcome Every person to order with self confidence. We provide the original official new or utilised Antminer S9k control board, with sufficient stock and high quality assurance. All control boards will go https://antminer-controll-boards04933.sharebyblog.com/37229022/antminer-s19-control-board-schematic-options