Laptop charger on high performance making "crackling" sounds

I've read multiple threads about how a crackling noise coming from a laptop charger is worrisome, but I recently I found that my laptop charger makes this sound only when my computer is running a high intensity program. Otherwise, the charger is completely silent and has no problems. Since I got this charger less than a year ago I am a bit reluctant to buy a new one. I was just wondering should I go and buy a new charger or is the noise normal?

Question by wednesdayweds on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.