Whats going to happen when Mantle is final as far as reviews go. Mantle changes things and makes the 290X faster than 780Ti in some games. I'm still going with a 290X, its a good time to be on an AMD card. Now that AMD has fixed frame pacing issues , and with mantle, I think a lot of people are ready to go back to AMD.
While I like the 290X for what it brings, the Mantle argument isn't yet valid. Mantle isn't on every game. So as soon as there is no Mantle support, that advantage is gone. Also crossfire is currently not working with Mantle. While i'm quite sure this will be addressed, I must be alone in thinking if XDMA(?) works for DX11 with the 290 cards, why does it not work in Mantle, AMD's own implementation? As good as Mantle is at being low level, the fact it was announced in October and it's 4 months on with only a beta driver should be a wee bit alarming. Announcing a new tech with a new product and releasing the new product (albeit it in Dec?) without the new tech is a bit of an 'oopsy' in PR.
Until Mantle is mature, it can't be considered a value proposition. In much the same way I'd scoff at someone saying Physx is a value proposition for Nvidia.
As for pricing, I'd rather spend a few bucks more for a 780Ti that will run faster in almost all DX11 games and even in Mantle, a 780Ti on a good cpu will probably still end up faster with decent clocks. AMD seem to take too long to deliver things. In the meantime Nvidia are rolling on as always, churning stuff out and asking a premium for it 'just because'.
After the 780 quickly followed Titan at a fraction of the price I was left a bit 'meh' with Nvidia. Unfortunately, the one card I'd like to play with, the 290x Lightning seems to be vaporware for now.
I went from AMD to Nvidia (7970's to Titan). Mantle isn't enough to make me want to go back and at the same time, I resent Nvidia for their pricing.
Aside from the 290X, I'm very keen to see what the games for this year bring to system requirements. Maybe then at my res (1440p) the 780Ti with 3GB will look a bit rubbish and that 4Gb 290X will look a whole lot more useful?