Replacement hash board for Avalon 921 This high-quality A9 hash board is used to repair an abnormal ASIC miner Canaan Creative Avalon A921. Avalon A921 is also known as AvalonMiner 921 / Avalon A9. Based on the SHA-256 algorithm, the hash rate can reach 20Th/s. When your hash board fails, it needs to be repaired or replaced in time to reduce losses and increase mining revenue.