Okay let me explain the situation properly.
I have 2 Computers. One is my main and other is a backup machine used for nothing actually except surfing.
1. My main currently has A8-6600K + Asus F2A55-M LK2 Board.
2. The second one has a AMD X2 - 270 Dual core + Asus M5A78 M LX2
Now I purchased a Graphics Card (R7 250X) Last month. It's doing really well in Games like Heroes of the Storm, Dota 2, Heroes of Newerth and WoW.
But since I have a AM3 lying around, I thought it's best to upgrade it with a FX-6300.
Also, I have found a buyer who is ready to take my A8-6600K for $80. So my total investment would be around $50 for the FX-6300. So my net investment is around $50.
So my basic question was, will FX-6300 + R7 250X do better than a A8-7600 (Kaveri) + R7 250X. Please remember that I only have options to change CPUs, I don't want to upgrade anything else. So have to work with what I have.
The question arised because A8-7600 has R7 onboard. So will be give me a performance boost with Dual-Graphics enabled alongside my R7 250X Graphics Card as compared with FX-6300 + R7 250X