Building 4x GTX 1080 recommendation

[timonline86]

Updated my question to a 1500/1600W PSU based on your advice.

Am I good to go with these specs?

      Case: Corsair 900D
      Motherboard: ASUS Rampage V
      Processor: Intel Core i7 5820K  (Plan to upgrade to i7 6900K eventually)
      GPU: 4x EVGA GTX 1080 Founder's Edition
      RAM: 32GB Quad Channel Memory running at 2400Mhz
      PSU: Corsair AX1500i 80+ Titanium