I assume you are using an AMD processor and you are stating TDP or Thermal Demand Power. This spec is very vague between AMD and Intel. Intel's TDP spec is vague for all of its processors while AMD is pretty consistent. AMD states TDP as "Thermal Design Power (TDP) is measured under the conditions of TCASE Max, IDD Max, and VDD=VID_VDD, and include all power dissipated on-die from VDD, VDDIO, VLDT, VTT, and VDDA." This means in laymen terms is basing on a constant voltage of processor and the current can not exceeded the total power handling of TDP. Basically it is the total heat index with out using a heat sink which is a worst case scenario.
This is taken from the following page.
http://www.silentpcreview.com/article169-page3.html
Intel's TDP is basically an average rating during use which is with or with out a heat sink.
In conclusion, AMD processors provides you all of its performance that you paid for while Intel is giving you less. Intel's TDP is average, but the amount of power could be more than this spec for a short amount of time. AMD gives you head room depending on the efficiency of the heat sink, but its maximum power will be about double or more with out causing too much damage.