ThinkCentre M90p Tower Core i5 3.3GHz 4GB RAM 500GB Hard Drive Windows 7 Professional 64Bit DVDRW Mid-Tower Business Black Intel HD Graphics 8 USB Ports Display Port VGA Serial Port Desktop Computer Lenovo M90p Tower Core i5 3.3GHz (i5-660) CPU 4GB RAM, 500GB Hard Drive 8 USB Ports, DVDRW Windows 7 Professional 64Bit