CPUs with four or more cores need not apply -- Alien: Isolation is seeking an affordable dual-core Core i3 processor but will also accept lowly Celeron, FX or Phenom II chips. Of course, that could change when running either SLI or Crossfire, but throwing that kind of GPU power at Alien: Isolation is a waste.
Given how well the Alien: Isolation benchmark ran on a Celeron G1820, we aren't at all surprised to find that there is no difference in performance between the Core i7-4770K clocked at 2.50GHz and 4.50GHz.
The FX-8350 benefited slightly from overclocking, though it was hardly necessary. Running at just 2.50GHz, the FX processor pushed the R9 290X to a solid 88fps.