bottleneck performance?

[Laraul]

A i5 4690k will almost be comparable to a i7 4790k.

i7 offers more hyper-threads (if i recall). It's mostly used for more intensive games (such as Crysis 3), or if you're into editting, Adobe Premier/After Effects/Photoshop.

Hyperthreading is Intel's Simultaneous multithreading (SMT) technology. For every core there are two logical cores. This allows one core to run two threads, thus increasing the efficiency of the processor by keeping the instruction pipeline clear of holes. For the players above can clearly see that only 80% of each of the four cores is being utilized. Hyperthreading provides a way to fill in that 20% with another thread, thus further increasing utilization of the CPU.

Will hyperthreading provide a noticeable performance improvement for games? Doubtful. In all honesty, the CPU really isn't a factor in games anymore with all the work being offloaded to the GPU.