Well I noticed the display was faulty and sent it back to be replaced by warranty. Expecting it to come back by thursday and I'll run the crucial tool then. Also, I tried looking for that model number on the crucial site, but it only showed upto inspiron 7559. Since the 7559 has many variations, I'm not sure if I should trust the result. Sorry about being so amateur-ish about this, I'm a 35-year old who just decided to pick up gaming this year.