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It's built for Tesla cards, not GeForce. Nvidia is packing two of them on a board, which means severely reduced clock speeds.
The most interesting thing to me is this:
"The GK210 also has double the register file size (512KB) and twice as much L1 cache/shared memory (128KB) per SMX as the GK110B. The additional local storage should allow the SMX to achieve more constant utilization in GPU-computing workloads."
Doubling the registers and L1 cache per SMX means this is new silicon, not just rebranding an old chip or even a respin. While very much derivative of previous Kepler chips, this has to be a new chip entirely.
I'm not sure how useful the extra registers and cache will be, though that presumably varies wildly by workload. If a workload is very heavily limited by register or L1 cache capacity, the new Tesla K80 could easily triple the performance of the Tesla K40--with the bulk of that improvement coming because of two GPUs instead of one. But look at Nvidia's reference benchmarks:
It's a little faster than the K40 in some benchmarks and a lot faster in others, but nowhere does it every double the K40's performance, let alone triple it. One would think that if the extra registers or cache were essential, Nvidia could have tracked down a benchmark that would show off the benefits.
It's also interesting that this is a very different direction from what they took with Maxwell, where all of the available Maxwell-based GeForce cards have a massive 2 MB L2 cache.
So what does this mean for gamers? Well, you're definitely not going to buy that GPU chip, unless you also do GPU-compute work, or perhaps Nvidia decides to sell salvage parts of it as a GeForce GTX 780. With only 13 SMXes, it can't be a GTX 780 Ti.
I'd interpret this as meaning that there isn't a huge Maxwell GPU chip coming soon, and it's far from guaranteed that there will ever be one. Designing a new chip is expensive, and Nvidia wouldn't bother with yet another new Kepler chip if a huge Maxwell chip for Tesla cards were only a few months away. Launching this now is entirely consistent with rumors that the big Maxwell chip is coming in 2016, though that's far enough away that Nvidia might want to move to some successor architecture by then, as Maxwell would be two years old.