Dual ATI graphics cards for 4k

Hi I just got a 4k monitor today but sadly my new 980 GTX didn't arrive at the same time. I've currently got 1 x ATI 5870 and 1 x ATI 5770 and this might seem like a stupid question but can I use an output on each to 2 inputs on the monitor to get it to work in 4k until my GTX arrives?
Thanks for any help

I was interested in what Barefeats said about the GTX 980 and 5k last week.
AMD R9 280+ cards can also do 4k and then you are not faced with "no native support with 10.10.0 installs" issue plus you can use Mavericks.
Also discussion on MacRumors:

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