I have my profile in setcpu down to 600/125 (running chevy 800mhz ulow) when charging to keep my phone from getting to hot (yesterday in the car with gps on and screen on bright it got up to 47C or so). When i plug it into the USB port on my computer, it goes down to 125 when idle. When its plugged into AC it hovers @ 400 and doesn't drop, same with my car cig lighter outlet charger. Anyone else experience this? I think it would partially explain the heat.