HP ProBook 655 G1 - A series A4-5150M / 2.7 GHz - Windows 7 Pro / 8 Pro downgrade - pre-installed: Windows 7 - 4 GB RAM - 500 GB HDD - DVD SuperMulti - 15.6" HD SVA eDP anti-glare 1366 x 768 ( HD ) - AMD Radeon HD 8350G - Smart Buy Take on tasks in the office or on the road with the durable HP ProBook 645 and HP ProBook 655. These ProBooks are thin, light and a great value. Enjoy enhanced productivity and do more - faster and better - to meet the most demanding workloads.