HP EliteDesk 800 TWR i7-4790 4GB memory 500GB hard drive Intel HD Garphics 4600 DVD+-RW Win8.1 Pro with downgrade to Win7 Pro OPK13 Cyberlink HP Client Security suite embedded TPM DTS audio 2 PS/2 port one Serial Port three independent displays support standard standard (1 VGA and 2 Displayports 1.2) 3-3-3 waranty Toolless serviceability