As briefly noted earlier today, Apple’s top-of-the-line dual 2.5GHz Power Mac G5 features a new liquid cooling system that is supposed to be more efficient than a traditional heat sink. “This system provides a continuous flow of thermally conductive fluid that transfers heat from the processors as they work harder,” explains Apple. “The heated fluid then flows through a radiant grille, where air passing over cooling fins returns the fluid to its original temperature. Mac OS X dynamically adjusts the flow of the fluid and the speed of the fans based on temperature.”