Dell Inspiron 3521 Impressive performance. Complete your to-do list faster and more efficiently with up to 3rd Generation Intel® Core™ processors. The Inspiron 15 balances fast processing with efficient power use. Never be without your digital entertainment. The Inspiron 15 is equipped with a DVD-RW drive so you can enjoy movies on-the-go. Starting at about 1” thin, the Inspiron 15 is sleek and portable. And its textured lid and palmrest design makes it as stylish as it is mobile.