GTX 1070 & 1080

[timonline86]

I apologize if this is a trivial question but I am currently building an Intel hashing machine and so far I have theses components

Motherboard: GA-Z170X Gaming G1
CPU: i7 6700k
Cooler: Corsair H110
Memory: 32 GB DDR4

Now the question is if I am to install 4x GTX 1080 which one should I go for the ZORTAC, MSI, EVGA, etc....

Should I opt for the one that has the highest clockspeed (1900 MHz if I am not mistake) or does a specific brand have an upper hand when it comes to hash cracking?

Thanks