Now, that must sound pretty inane. Overclocking a PC seems to be as far apart from power saving as it can get. After all, overclockers employ all kinds of power-guzzling methods to improve their CPU's overclockability, from increasing the CPU core voltage to employing more powerful cooling systems. Even the act of increasing the clock speed increases power consumption.
Tech ARP - Reducing The Power Consumption Of Overclocked PCs
Good read although some points (like C n' Q and EIST) are well known :hap2: