Lenovo ThinkCentre M90z 0870 - All-in-one - 1 x Core i5 650 / 3.2 GHz ( 3.46 GHz ) - RAM 4 GB - HDD 1 x 500 GB - DVD-Writer - HD Graphics - WLAN - Windows 7 Pro - Monitor : 23" Widescreen TFT - Microsoft Office Ready Refresh your fleet of PCs with ThinkCentre M Series desktops. Smarter, stronger and more up to date for better business performance, easier manageability, state-of-the-art security and great ROI! These best-in-class desktops deliver the latest technology for industry-leading performance, strong stability and easy manageability, helping boost productivity and reduce IT costs. M Series models offer improved overall system performance, optimized for the most demanding applications.