Rosewill Hercules 1600 Watt power Supply

I think that the problem that I am having with the fourth GPU card not showing up in the device manager is that 1200 watts is not enough power for all cards at one time. Took out one card and now all three show up okay. Before, maybe three would show up, maybe two would show up, but never all four.

After some research I have seen that 1600 watts is required for this setup.  Wrote to Rosewill for some help on a donation of the Hercules 1600, a very impressive power supply, to see if they can help me out with that donation.

It's frustrating that I have not been able to get all four cards to work at once and stay that way.  Wish
me luck!!

1-05-2015
 I haven't heard from Rosewill about this power supply as of today.

1-05-2015

Looked  at Corsair's page on power supplies and it seems that the AX1200i that they donated WILL power the four GTX 780ti SC cards. I will have to place this setup in a tech station and try again and see if all four cards post.  At one time I did have all cards posting but after several days only three or two cards would show up.  Let's see what happens.