Currently, the internal computer uses a hard coded amount of power plus a combined amount of power based on the number of consoles installed and the weapons installed on those consoles. At least I believe that is true.
The system should accomodate the setting of optimal power consumption instead of the hard-coded value. That would give ship designs a bit more flexibility and the ability to have different 'levels' of computer types installed.
The end power consumption should revert to the original fixed value if the optimal power level has not been specified for backwards compatibility. Likewise, the consumption of power for the consoles/weapons shouldn't be modified so current installations will not be broken.