The GTX 680 is still an impressive piece of technical engineering this far down the line. Released back in March, Nvidia's current flagship card is still at the top of the graphics tree, duking it out with AMD's HD 7970 for GPU supremacy. That's impressive given the fact that its GK104 is a far simpler bit of silicon compared to the Tahiti XT behemoth in the AMD card.
The GK104 is a 3.5bn transistor chip verses the 4.3bn transistor Tahiti XT core, and as such is smaller and more power efficient. That's quite a change compared to the Fermi generation where the top GTX 480 and GTX 580 housed massive, power-hungry GPUs chock-full of CUDA cores and SM units.
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