Ah OK I didn't realize that you had 5820 K - Very nice - I have one!
What I meant to say was X99 Professional i7 has Intel turbo max technology 3 - Where as the Extreme 4 & Fatal1ty do not - As I've learned a bit more about computers [novice builder] I find I am liking and appreciating AsRock a lot more.
How does the VRM [voltage regulator module] differ on Pro i7 vs Fatal1ty ? - 12 phase isn't it? - Isn't it the same on all three? - Maybe Fatal1ty X99X has the edge due to OC'ing but i7 Professional has Wi-Fi / 3.1 / and OC socket [like Asus] - But they're both great
With you having 5820 K you don't get turbo max 3 technology [only one core?] - Is Intel turbo 2 technology on all cores?