CPU Performance
The latest Core i7 and Core i5 processors were able to extract the most performance out of the GeForce GTX Titan X at 1080p, resulting in an average frame rate of between 67 and 72fps. The AMD FX-9590 was capped at 60fps making it 1fps faster than the old Core i5-2500K. Meanwhile the Core i3-4130 was good for 48fps, making it just 3fps slower than the FX-8350.
Overclocking the Core i7-4770K didn't help squeezing more performance out of the GeForce GTX Titan X, while reducing the clock speed to just 2.5GHz didn't impact performance greatly either.
Unfortunately when clocked at 4.5GHz the AMD FX series isn't able to match the Haswell Core i7 clocked at just 2.5GHz. We suspect the FX-9590 would need to be locked at 5GHz to match the Core i7-4470K at 2.5GHz.