GDDR6X is a type of graphics memory used in high-performance graphics cards. It is an evolution of GDDR6 and offers faster data transfer rates, which enhances the performance of gaming and professional applications. This memory type is designed to handle the increasing demands of modern graphics processing, providing improved bandwidth and efficiency. The key feature of GDDR6X is its use of PAM4 signaling, which allows it to transmit more data per clock cycle compared to its predecessors. This results in higher speeds and better overall performance, making it suitable for advanced tasks like 4K gaming and real-time rendering in 3D graphics applications.