140 Watt TDP (Phenom IIX4 965 (HDZ965FBK4DGI),3.4GHz,140Watt). The Thermal Design Power (TDP) is the average maximum power a processor can dissipate while running commercially available software. TDP is primarily used as a guideline for manufacturers of thermal solutions (heatsinks/fans, etc) which tells them how much heat their solution should dissipate.