My friend is currently planning on building a completely new gaming rig with high end parts using a gtx 980 as the gpu or maybe one of the new amd 300 series. Originially the cpu i was planning to use was an i5 4690k as 2 years ago i bought a 4670k and has been fine and nowhere near bottlenecking any of my games up until just now when playing gta V. The cpu utilization was fluctuating at 100% causing some really annoying stuttering. I fixed this by turning some cpu intensive settings down. Meaning i cannot make the most of my gtx 780. I have also heard that more games will follow in this fashion of beig very cpu intensive so has lead me to lean towards the i7 4790k for my friend for some future proofing so it definitely doesnt bottleneck any games. Also so he wont have to replace it for a longer while. But is this worth the £100 premiumover the i5?