On the other hand, the typical replacement candidate for any Nvidia, is the same performance reference @ 2 gen's upwards. As we're apparently skipping the 800 convention for the high end desktop series: if you have a 690, you'll be looking for a 990 once it's out, if you have a 670, a 970, and so on... Personally, I find that most times a single generation bump is not worth the cost or bother for the little performance gains one will have.
~ Myagui
I was all the time looking forward to the 790 / Titan Z. But Nvidia made it a very long wait (it was hyped and announced months ago) and once the price tag of 3000 Dollar was known it became obvious that Nvidias double GPU path is dead for the consumer marked. You can't sell 3000 Dollar cards to private consumer.
Also AMD will have a hard time with its R295 which is half the price and water cooled but still they are at least in a half way sane price range. Just that 2 single card is soo much cheaper...
I expect the very same to happen with the 990 now. It will come out at the very end of the Generation so month or years from now and with such a bad price/perfomance relation that it is uninteresting.
I have seen crypto performance of the Titan cards listed here (don't ask me which ones the Titan nameing gives me headach they should have keept the numbering). My 690 card performed still better than them (more hash in scrypt and x11). I am not up to date with the very latest. So it might have changed. I don't know.
The new GTX980 will very hopefully beat my 690. The price will not be much lower than what I payed for the 690 (1000 dollar) So I will get a bit more for a bit less cost performance whise but not the world after that long wait.
The real benefit of the card of course will be the much lower energy consumption this is truely positive. If it were still profitable to mine crypto with GPU than I would be very happy waiting for the GTX980.