What do you need to do when the Antminer R4 hash rate drops or goes to zero? You first need to replace your damaged hash board with a high-quality R4 hash board. The Antminer R4 uses a fully custom, state-of-the-art BM1387 chip with ultra-low power 16nm technology. All R4 hash boards are tested and configured before shipment to make your setup as simple and seamless as possible, just get started and use it directly; please feel free to consult our account manager for details.