Using 4 Gigabyte GTX 980 Ti G1 gaming 6gb

[TheNoisy1]

If I want to put another two gigabyte gtx 980 ti g1 gaming 6g to the other 2, what power supply capability do I need. I am using the Intel i7 5960X Extreme Edicion and the SuperFlower Leadex Titanium 1600w

 

[ImDaBaron]

I'm fairly certain that's enough.

 

[pomps74]

that is a good enough power supply