"Windows System Performance Rating effectively assigns a numerical rating between 1 and 5 to a PC, based on components such as the CPU, system memory speeds, disk speed, and two measurements in graphics," Mather told TG Daily. He was prevented from going into detail about the formula used to derive the rating, which is apparently still under development.More details over here.
Windows Vista computers to use five performance tiers
Posted on Saturday, February 18 2006 @ 15:15 CET by Thomas De Maesschalck