Product Title: Controller Motherboard for Bitmain Antminer S21 - PCB Circuit Boards, Tested and New Product Description: [Reliable Controller Motherboard for Bitmain Antminer S21]: Ensure the optimal performance of your Bitmain Antminer S21 BTC Miner with our high-quality Controller Motherboard. This PCB circuit board has been rigorously tested and is guaranteed to be in good working condition, providing you with the reliability and efficiency needed for your mining operations. [Key Features]: Designed for Antminer S21: Specifically designed for use with the Bitmain Antminer S21 series, ensuring perfect compatibility and seamless integration with your mining setup. High-Quality Construction: Built to meet the highest standards, this controller motherboard is made from durable materials to ensure long-lasting performance and reliability. Tested and Verified: Each board has been thoroughly tested to guarantee optimal functionality, providing you with a dependable solution for your mining needs. Easy Installation: Designed for straightforward installation, allowing you to quickly replace or upgrade your existing controller board with minimal downtime. [Specifications]: Usage: Control Board for Antminer S21 series Connector: 4 x 18-Pin connectors Condition: New and tested good [Package Includes]: 1 x S21 Control Board [Why Choose Our Controller Motherboard for Antminer S21?] Enhanced Performance: Ensure your Antminer S21 operates at peak efficiency with our reliable and high-performing control board. Dependable Quality: Each board is tested for functionality, providing you with a product that meets the rigorous demands of cryptocurrency mining. Simple Installation: Easy to install, allowing for quick replacement or upgrades to keep your mining operations running smoothly. [Applications]: Ideal for maintaining or upgrading your Bitmain Antminer S21 BTC Miner, ensuring reliable performance and efficient cryptocurrency mining. Upgrade your Bitmain Antminer S21 with our reliable Controller Motherboard. Tested for optimal performance, this PCB circuit board ensures your mining setup remains efficient and effective. Order now and keep your mining operations running at full capacity! Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.