HP Z440 Tower Server Bundle with Windows 10 Pro Operating System Tower - Server Specifications: Processor: Intel Xeon E5-2620 v3 6-Core 2.40GHz 8MB CPU, Turbo up to 3.20GHz - Memory: 96GB DDR4 PC4-21300 2666MHz Unbuffered Memory - Hard Drive: 240 GB SATA III SSD for Ultra Fast Storage - Server RAID Controller:LSI 9217 4i4e SAS SATA Raid Card - Power Supply: Single Cabled Power Supply - Server Optical Drive: DVD-ROM - Operating System: Microsoft Windows 10 Pro - Hard drives and memory included separately NOT installed, installation required.