A portable electronic device is disclosed. A first bridge operates as a root bridge and each node includes two ports where each port is coupled to a respective one of the bridges. This will increase the frequency for the onset of the resonance driven by the RF voltage drop across the attenuator. The number of processor clock cycles counted is divided by the number of reference clock cycles counted and the result is multiplied by the frequency of the reference clock. Because the power node is designated as an ideal power node, the results of the sensitivity model for each fan-out block can be added asynchronously to a total loadings of the power node. At least the first part of the housing is pressure sealed encapsulated and filled with oil under pressure.