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