Xeon D-1541 8-Core 2.1GHz CPU, Up To 2.7GHz Turbo; 64GB DDR4 ECC UDIMM Memory; 64TB (16 x 4TB) SATA 2.5' SSDs for Ultra-Fast Storage Securing Your Business Assets: The Synology RS4021xs+ is a 16-bay NAS that prioritizes data security and delivers lightning-fast performance, boasting over 234K 4K random read IOPS and 6,258 MB/s sequential read throughput Engineered for Service Continuity: The RS4021xs+ is designed to ensure mission-critical data availability, even in the face of disasters With redundant power supplies, hot-swappable fans, and Synology High Availability (SHA) for active-passive clustering Storage for Virtualization: Synology iSCSI storage seamlessly integrates with mainstream virtualization solutions such as vSphere, Hyper-V, XenServer, and Cinder. With features like vSphere 6.5 and VAAI integration, Windows Offloaded Data Transfer (ODX), and Synology Storage Console, the NAS enhances usability storage provisioning and management in virtualized environments