Redefine versatility and flexibility. Expand your capabilities with HP’s Z640 Workstation offering powerful performance, whisper-quiet computing, and tool-less access in compact design. Features Windows 8.1 Pro or other operating systems available Power up - Experience massive workstation power with support for 145W processors powering up to 36 cores in a dual Intel® Xeon® processor configuration. The HP Z640 Workstation uses Z DNA to provide a high-end workstation experience. Versatility redefined - Build the perfect workstation for your needs. The HP Z640 Workstation featuring Windows 8.1 provides incredible expansion in a small footprint. With up to 8 memory DIMMs, up to 4 internal hard drives, optional Thunderbolt™ 2, and the HP Z Turbo Drive, you get storage, performance, and the freedom to create. Experience the quiet - Concentrate on your work using a workstation that is whisper quiet. When every inch, watt, and decibel makes a difference, count on the HP Z640 Workstation. Featuring: Primed to perform - Achieve the performance you need with the ability to support two next generation Intel® Xeon® processors for up to 36 total processor cores in one system. See everything clearly - Take productivity up a notch with the ability to do more thanks to NVIDIA professional graphics cards in 2D or 3D. Graphics pro - Get serious about graphics and reach peak productivity with access to a breadth of AMD professional graphics from entry to high-end 3D. High-power ports - Maximize your time and increase your capabilities with USB and SATA ports, plus lightning-fast data transfers using optional Thunderbolt™ 2 technology. Conveniently compact - A tool-free chassis boasts low acoustics, single integrated Gb Ethernet, a front handle, rear ledge and is 4U rack mountable—all in a compact design. Set a new performance curve for your HP Z640 - Reduce boot up, calculation, and graphics response and revolutionize how your HP Z640 handles large files with the HP Z Turbo Drive, a remarkably fast and innovative storage solution. See every angle - Take multitasking to a new level with the ability to easily connect and work on up to eight displays. Your personal system engineer - Optimize this HP Z640 for peak performance. HP Performance Advisor configures your system with updated settings and drivers to help maximize performance. Device management made easy - Each HP Z640 Workstation works with HP Client Management Solutions, and optional Microsoft® Systems Center Configuration Manager to deploy, manage, and secure your PC.