I have a system with one R9 270X already and have $200 and am thinking about getting another. I have an AMD FX-8320 overclocked to 4.2 GHz (Cooled with H60) and an ASUS M5A99X EVO R2.0. I have one MSI Gaming R9 270X and am wondering if the dual X8 versus single X16 slots will bottleneck me in BF4, as well as the CPU at 4.2GHz. Also, what is the difference between X8 and X16 and will the Crossfire Bridge reach the other card when it is in the other slot? Thank you very much!