The new D-Series Rev.D 15" All-in-One Touchcomputers continue to bring the same style, flexibility and functionality to point-of-sale (POS), retail and hospitality businesses as the previous versions. New for the D-Series Rev.D models are the latest generation Intel 2.5GHz G540 Celeron Dual-Core processor and H61 chipset with advanced Intel® HD Graphics processing. The Intel 2.5GHz G540 Celeron Dual-Core processor is perfect for any POS application. For customers who require additional performance or more robust storage capabilities, the addition of a 2GB RAM option kit or second 320GB hard drive can significantly improve the performance or expand the data storage of the D-Series Rev.D touchcomputers. Also new for Rev.D is the addition of Microsoft Windows 7 Pro 64-bit operating system.