CPU fan 1 or 2?

[BortW]

So I have the i7-6700k, Cryorig H7, and MSI Krait 3x. The fan is mounted to blow towards the IO Shield (The actual fan is right next to the DIMM Slots). The Cryorig H7 has 4 pins. Do I use fan 1 or fan 2? Thanks!
EDIT: Mobo nor CPU Cooler say which one to use in their manual

 

[dudio]

It doesn't really matter. There's two headers because some coolers have two separate fans. Number 1 would be a normal default.
Also, if you can, it might be better to aim fan to intake from front of case and blow out towards rear of case to help with airflow design