It will most certainly make your pc better to get a better GPU. I can guarantee it. And no it's not always a mistake to buy an AMD processor lol, I have one and it suits me fine. Granted, in a perfect world I would own an i7-3770k right now, but is it worth it to buy a new motherboard, a new copy of Windows, AND a new CPU? nope, not even close. That'd be $500 minimum. If you really want a new CPU, then I would buy an HD 7950/70 or GTX 670/80 now, and then wait for Haswell to come out in March.