FUD Zilla believes both ATI and NVIDIA are going to rely more and more on graphics cards with multiple cores or chips.
ATI's R680, a graphics card with two RV670 chips, or Nvidia's soon to be announced D8E dual G92 card are just the first step in this direction.
The next step is to put these two cores on the same die, the same way that the CPU industry decided to go about it.
The reasons are quite obvious and simple. Nvidia and ATI are getting close to a billion transistors at 128 Shader units with up to 800MHz core clock and in the future, even with 45nm it cannot get much better than that.