More power is to overcome switching losses and parasitic reactances. You can increase drive strength up to a limit to overcome this, but a slight clock reduction will make things work at the same power.
CPU's and GPU's reclock extremely fast to my knowledge, but what we're talking about isn't dynamic reclocking, just limiting the max clock as suitable to the system design.
We already see this when we have laptop silicon that run faster clocks when using soldered RAM compared to when the same silicon is using socketed counterparts.
That this wasn't an option probably mean that they're either far too close to the limit, or unwilling to allow a design that runs below max speed.
CPU's and GPU's reclock extremely fast to my knowledge, but what we're talking about isn't dynamic reclocking, just limiting the max clock as suitable to the system design.
We already see this when we have laptop silicon that run faster clocks when using soldered RAM compared to when the same silicon is using socketed counterparts.
That this wasn't an option probably mean that they're either far too close to the limit, or unwilling to allow a design that runs below max speed.