Will an fx 8350 bottleneck 2 gtx 780ti's at a 4k resolution?

I had an FX-8350 and a 780 Ti combo and yes it definitely held my 780 Ti back quite a bit even at 1080p. Switching to 4770k yielded a huge difference in performance in Skyrim and BF4.

I imagine the bottleneck would be even more apparent in a SLI configuration.