It might be stored in /etc/conf.modules or /etc/modules.conf I believe.

> When installing Strom on a box here at work, the install prompts for the
> NICs in the box. If these are changed later there seems to be error messages
> during boot up about the changed NICs. This leads me to think that somewhere
> the NIC and related driver is stored. This should be something I should be
> able to change myself if I change the NIC.
> 
> Questions:
> 
> If this is true, where is this information stored?
> And how do I change it?