Lenovo ThinkCentre M73 10AY008CUS Tiny Desktop (Intel i5-4590T Quad-Core, 4GB, 500GB, Windows 7 Professional), Black Intel Core i5-4590T Processor 2 GHz( cache) 4GB SDRAM DDR3; 500 GB 7200 rpm Hard Drive,Intel HD Graphics 4600; Intel 7260 b/g/n WLAN Chipset-Socket: LGA1150 Type: Intel H81 Express, Windows 7 Pro 64 Downgraded from Windows 8.1 Pro Lenovo's limited 3-year warranty includes limited onsite service