Well.. don't forget guys, that its not just the CPU. For example, what video card you run:
Again, my dad's E4300 uses around 107-109watts idle (@2.4ghz) using 7300GT. My system (E4400@3ghz) is very similar to his, but I run the 8800GTS 320mb card. It idles at 170Watts (I did add a HD TV card to my system).
So when I'm running folding on both cores, my system uses 207-210 watts, and thats without the GPU running or doing anything at... all.