MSI is debuting their E 3 PowerCube technology on their FX5600 series of videocards. The PowerCube is actually composed of two inductors, & the goal of the cube is to enhance the "conditioning" of the power/current going to the GPU. Not only that, it also apparently "greatly reduces the heat generated by the two MOS tubes."

"The second advantage is its responding speed of generating a high-frequency signal for the front MOS tube. Because the MOS tube switches constantly between high voltage and 0 voltage signals, the highest frequency can reach a few hundreds KHz. MSI E3 PowerCube can respond to this high frequent signal very quickly. This improves the efficiency of voltage-regulated smoothing, and lowers the probability of the two MOS tubes to malfunction (connected) and to breakdown."