The A12X Bionic chip with 64-bit architecture used in the iPad Pro 12.9-inch 3rd generation is a high-performance processor designed by Apple. It features an 8-core CPU and a 7-core GPU, making it capable of handling complex tasks such as 4K video editing, 3D modeling, and augmented reality applications with ease. The A12X Bionic chip also includes an improved neural engine, which is optimized for machine learning and AI tasks, enabling the iPad Pro to perform up to 5 trillion operations per second. The chip is also designed to deliver improved power efficiency, providing up to 10 hours of battery life on a single charge. Additionally, the A12X Bionic chip includes Apple's Secure Enclave technology, which provides advanced security features for tasks such as biometric authentication and data encryption. Overall, the A12X Bionic chip with 64-bit architecture is a key feature that contributes to the exceptional performance and versatility of the iPad Pro 12.9-inch 3rd generation.