A shaped insert that includes a top portion, and a grip length, wherein the grip length is modified to have a non-uniform cross sectional area is disclosed. The energy return heel mechanism comprises a spring lever pivotally mounted against a fulcrum. In one embodiment external heat pipes allow several different heat sources to be connected. The prefetch code is specifically configured for monitoring the parent core based on a specific application being executed by the parent core. The ASIC is positioned along an extending direction of the scan lines.