A high-capacity 64GB DDR4 ECC registered memory module with quad-rank x4 organization operating at enhanced 2666 MHz for Cisco systems. Features ultra-high memory density with both ECC error correction and registered buffering for maximum data integrity and signal reliability. Provides maximum single-module memory capacity with comprehensive data protection designed for Cisco's mission-critical applications. Designed for Cisco servers requiring extreme memory capacity with enhanced reliability and proven Cisco compatibility.