How does Capacity Planner determine the native MHz for proposed new hardware?
Capacity Planner reduces the amount of native capacity when multi-processors are involved. The rule of thumb in the industry is to reduce the amount of native capacity available to 80% of the original rating for the second processor. Subsequent processors are multiplied by .8 raised to the power of the slot number of the CPU. So the third CPU contributes .8 raised to the second power multiplied times the rated speed (the third CPU is in slot 2 because slot numbers begin with 0). If this is a 64-bit processor, the percentage is raised to 90% due to improvements in the technology. Therefore, the variables are the number of processors, the rated speed, and the slot number.
