Lenovo ThinkCentre M73 10AY001YUS Tiny Desktop (2.90 GHz Intel Core i5-4570T Processor, 4GB DDR3, 500GB 7200RPM HDD, Windows 7 Professional) Processor:&nbsp;Intel Core i5 4570T Processor (2 cores / 4 threads 2.9GHz 4MB cache) Hard Drive:&nbsp;500GB 5400RPM Serial ATA 2.5" Hard Drive and 8 GB Solid State Drive RAM:&nbsp;&nbsp;4 GB PC3 12800 DDR3 SDRAM 1600MHz SODIMM Memory Operating system:&nbsp;Windows 7 Professional 64 - English (Downgraded from Genuine Windows 8 Professional) Optical Drive: None