How many radiators do i need?

[PC Gamer 2000]

How many radiators do i need for a custom waterloop? I would be watercooling an intel core i7 6950x Processor and 2 titan x pascal gpus
I'm using a corsair 780t case and a corsair ax1500i power supply

 

[ryguybuddy]

Damn thats a nice rig! A 480mm will suffice but dual 480mm would be better if that case can fit it.