The Bitmain Antminer Control Board (S19 Hyd., T19 Hyd., S19 Pro+ Hyd., S19 XP Hyd., S21 Hyd., T19 ProHyd., S19e XP Hyd., S21 XP Hyd. ) optimized for air-cooled, this high-quality control board ensures uninterrupted mining, efficient cooling, and comes packaged separately with support. By purchasing a new control board instead of repairing and replacing control board parts yourself, you can greatly save operation and maintenance time and costs, and replacing the control board is faster and more convenient.