Calin said:
Does overclocking the CPU will make the motherboard drain more power?

increasing the frequency increases the power drain, but indirectly you will consume even more electricity: you have to increase the voltage to be able to operate at higher frequencies. lower frequencies can operate with lower voltage. overvolting and overclocking a cpu will result in quadratic increase of the power draw. for example, imagine a 3 ghz cpu at 1.0v consuming 50w, olverclocked to 4.5 ghz at 1.3v will increase the power draw to around 100w. a significant undervolting and underclocking in the same time has also have quadratic effect on our imaginary cpu, so downclocking your cpu to 1.5 ghz at 0.7v will drop the power draw to 25w or so. the same applies to gpus, memory, and other cmos devices. please note, modern cpus and gpus downvolting and downclocking themself in idle, halving your power bills.

your 60 hz wall plug has ABSOLUTELY NOTHING to do with this. the power from the psu is transformed into DC power.