The AvalonMiner 821 is the ROQ Solid Miner, Refined. The AvalonMiner 821 is made with Reliable Open Quality, now with Airforming Cooling Technology. Containing 104 x A3210 16 nm chips, AvalonMiner 821 is the latest Canaan AvalonMiner with a 11.5 Reliable Hashrate Per Second (RTHS).