ThinkCentre M72e (3x3 Tower) 3/3 Warranty Intel Core i5-3470 Processor 3.2GHz 6MB Cache 4GB Memory 500GB HDD Windows 8 Pro 64bit downgrade Windows 7 Pro 64bit with Win8 Pro 64 RDVD DVD Recordable Gigabit Ethernet Adapter Integrated Intel Graphics Lenovo USB Preferred Pro Full Size Keyboard Lenovo Enhanced Optical USB Mouse Internal Mono Speaker Second HDD Bay