This will protect the two major entry points of power to your system. There is a huge difference called speed. The quicker the rating, the quicker it can throw the breaker in the event of a power surge. One of the greatest destroyers of electronics is heat. Out of the box, your computer will be able to easily cool your system to a comfortable operating temperature.
Dust build up and fan failure.
If you live in a dusty are or have house pets that shed, your system can probably use a good cleaning. The best way to accomplish this is to purchase a can of compressed air. You will need to completely unplug your computer and remove the cover or case. If you're not sure how to remove the cover, check your owners manual. It is probably best to carry the unit outside before spraying it with compressed air.