I'm building my first gaming PC and I don't know if I should choose the i7 4790 or the i7 4770. The 4790 is about $10 cheaper. I know it's a small amount of money but I just don't want to waste money on something that I don't need. Is there a noticeable difference? Also, should I use the stock CPU cooler that comes with either of them or should I buy a separate one?