I'm looking to ditch my 2 x 680's for a 780Ti.
I know this is a side grade but I would prefer 1 card.
I must admit though I have been tempted by 2 290's in crossfire but the heat and especially the noisy fan does concern me.
Lets also not forget crossfire implementation is game specific like SLI so it works well some times and other times it is a pile of rubbish.
Frostbite mantle support does interest me as well but loosing GSync is a bit of a pain. I think Gsync is more important but I see no indication of getting a 1440P IPS panel with Gsync support this side of xmas or even before we get the next gen GPU's
Are the 290's really that noisy I am guessing with a single PCI slot gap the top card would probably cook big time.
I'm also looking at the 780ti to replace my SLI 680s. But that's mainly because I'm hitting the 2GB vram limit in BF4 @ 1440p which is really disappointing. That or 2x 780s depending on how its priced.