[bobkoure]

One way to figure your wattage if you've an idea of your PS efficiency, is to us a kill-a-watt power meter on your AC (they're about $35).
1) measure with processor un-overclocked and un-overvolted (and either idling or full out - seems to me that AMD wattage specs were for full out, but I could easily be wrong).
2) overclock the processor
4) measure in the same state as above (full out or idle)
5) take the difference (you did use more when overclocked, right?), apply the PS efficiency, then add that to your base 65W to get a notion of how much power you're using