I'm running an i5-4670k at stock speed (3.4GHz) and that thing chews up and spits out everything I throw at it. And you're getting an i7-4790k, geez...
If you want faster RAM though, I'm running the Geil Evo Potenza 2400MHz stuff and it's great stuff for the price. I think I got 2x4GB sticks for...