Applicable to Avalon A 721 741 761 821 841 851 921 911 and other popular models, new stock, suitable for Avalon A7 A8 A9 A10 modelsThe Avalon Miner 741 is the ROQ Solid Miner, Refined. The Avalon Miner 741 is made with Reliable Open Quality, now with Air forming Cooling Technology. Containing 88 x A3212 16 NM chips, Avalon Miner 741 is the latest Canaan Avalon Miner with a 7.3 Reliable Hash-rate Per Second (RTHS). By connecting our AvalonMiner Controller (sold separately) to a single AUC3 (AvalonMiner USB Convertor 3), you may connect five AvalonMiners. For maximum usage, you may connect the AvalonMiner Controller to 4 AUC3 devices which may each connect to 5 AvalonMiners for a total simultaneous management of twenty AvalonMiner 741 to reach 146 TH/s (RTHS)..If any problem occurs, contact us immediately Via eBay messagewe will do our best for you,thanks !