Undo overclock on game pc?

Is there a way to undo the overclock of the in game computers?

I found the +4 focus moodlet amazing, until I had one of my sims start the writer aspiration and the +4 focus moodlet trumps over any inspired moodlet...

I want to undo the overclock, so I don't have the +4 focus moodlet, but the option is greyed out. I have the computer fully upgraded, I don't want to have to buy another, or replace this one...