I am beginning to think that's incorrect. That person only tested one game. And, it's been repost countless times as proof. Here's another one with Metro and GTAV showing hardly any differences.
Huh, ok then. Wonder why the Watch Dogs test was so skewed.
2,666Mhz seems to be the sweet spot from a price performance standpoint. Even up to 3,000Mhz is pretty good. Beyond that, it just seems like you're wasting money.