The Crossfire configuration will have significantly more raw performance (it's like comparing a GTX 780 Ti to two GTX 780s in SLI). At the cost of more power consumption and potentially more noise, plus the general drawbacks of Crossfire.
"In today’s games, and at resolutions as high as 3840x2160, 780 Ti’s 3 GB should be sufficient. However, it’s already possible to punch above that in Battlefield 4 using three 2560x1440 monitors."
Guys, I'am gonna buy CM storm stryker or R4 blackpearl silence case. I'am not gonna hear the graphic cards that much. I'am using headset with really high volume btw
Anyway, since I'am gonna play BF4 on ultra 5760x1080p I want highest FPS as possible. 50-60+
No it hasn't.. The 290X and 780 TI are very close and essentially swap blows.. This will probably not be the case when the non reference cooled 290X shows up and the inconsistent behavior we are seeing will disappear. 290X in Crossfire also pretty much obliterates any 780 in SLI so it's really the no brainer choice for 4K gaming. You also have to keep in mind that the 290X is also about $150 dollars less expensive on average.
my 2 GTX 780s in sli are really bad so i would go amd if they get 99% usage on both cards. my 780s only got to 50-60% usage and would drop below 60 frames