HP 4GB DDR2 PC2-6400 SoDIMM Experience easy access - both inside and out with a tool-free chassis and convenient FireWire and USB ports on the front Fine-tune your workstation's performance - and maintain your drivers, operating systems, and applications with HP Performance Advisor Be future-ready - with expanded PCIe, FireWire, a whopping 11 USB interfaces, a range of SATA, eSATA, and storage bays Reliable enterprise-class technology at an entry level price - includes ECC memory that helps ensure data integrity and higher system uptimeSpecifications HP Z200 Intel Core i5-650 CPU, 320GB SATA 7200, DVD+RW, 4GB (2x2GB) DDR3-1333 memory, Windows 7 Professional 32-Bit