Soldato
I tested a 2550K at stock (with intel turbo boost) and 4.6Ghz in Witcher 3 and GTA V. GPU was a GTX Titan and 16GB 1600Mhz memory. Witcher 3 saw about an 8% gain in Novigrad (the most CPU demanding area) and in the GTA V benchmark the difference was negligible. I don't really know what to think of these results.