Lenovo Desktop ThinkCentre M90 Pentium Dual-Core 2.80GHz Bus Speed 2.50GT/s 3 MB Cache RAM 2GB 250GB SATA DVD Multiburner Gigabit Enabled (1.00 Gbps) Local Area Network Capable Microsoft Windows 7 Professional (32-bit) License Only - No OS Installed U.S. English Desktop Small Form Factor Black