Overclocking Power Dissipation for C2duos

I was pointing out in another thread that the max power TDP of the X2 6000 didn't mean so much! Since most often those chips wouldn't be at the TDP much (often less than 5 minutes a day). (remember how AMD uses "TDP", and remember QuietN'Cool ?)
.....and how at max power compared to an 80 watt chip, for 2 hours of encoding ya got about 2 cents of electricity use difference there, etc...... and it made me remember how when you overclock you're usually burning more than the spec power, and I got curious.

Anyone ever see or figure a number for the power dissipation of C2duos at 3.5Ghz (say given the most common over-volting level for that) ?

Also, when you overclock a C2duo, is there any way to still have an automatic power saving step down (other than standby mode)?

One of the especially neat things coming from Intel eventually is where one core can be overclocked while the others are practically shut down! Now *that* is neat!