HP Compaq Pro 6305 SFF A8-6500B processor 4GB memory 500GB hard drive AMD Radeon HD 8570D graphics DVD+-RW Win8.1 Pro downgrade to Win7 64 OPK Cyberlink HP Client security suite 10GB of BOX cloud storage embedded TPM SRS Premium Sound 2 PS/2 port one Serial Port one parallel port Dual Display support standard (1 VGA and 1 Displayport 1.2) DASH 1.1 3-3-3 waranty