How much wattage does 2X GTX 780 TI in SLI need?

DetonatedBalls

Reputable
May 4, 2014
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I'm not sure how much wattage I need for a power supply unit.
Parts:
Asus Maximus VI Hero
I74770K
2X GTX 780 TI SLI
4TB HDD
120GB SSD
6 Fans