[chronster]

OK, please correct me if I'm wrong, but underlocking the cpu can only draw less energy to a point. I mean, the difference between 19mhz and 200mhz would be the same because the device is still sending the same voltage to the cpu right? Unless the device automatically determines what the cpu needs to function correct (which I highly doubt) you'll need to tweak the voltage somehow also.

Think of it this way: I've got a cpu in a computer running at 4ghz at 1.5v. If I underclock the cpu to 2ghz, the vcore setting is still 1.5v so the same amount of energy is still being sent, just not being used, right?

As far as heat goes, it's the same. If you're pushing the limit at which a certain amount of voltage achieves a certain clock cycle, then there's going to be some resistance which causes slightly more heat than if you're simply over volting your cpu, but it doesn't matter if you're running 10mhz or 200mhz, the voltage is what's causing heat. Too much voltage causes heat, and too much resistance causes heat. Finding that sweet spot is the key.