Why are they comparing it to the 680?
The jumps in performance over the 780 aren't huge and it's actually a bit weaker than the 780ti in some areas. So that wouldn't look that great.
The 680 series was a huge jump in performace/power consumption, that's what the 900 series is. The GTX 980 can perform at the same level as a GTX 780ti but at nearly 100 watts of power less. That's a massive improvement. Basically they are getting way more from less power.
The GPU performance increase is secondary to the power efficency increase. That's the point of the first run of Maxwell cards. They couldn't get the sub 20nm dies to work though. Those have been put off until a later date. The new architecture can still be applied to the 22nm dies and still save a lot of power. When the 16nm dies finally become a reality we'll see a big jump in performance, heat, and power consumption again.
If you would have seen the show you wouldn't say that. There's a lot more to this than just power efficiency, the tech in the gtx 9 series is simply revolutionary.
No they are not revolutionary What Maxwell show cased new was DSR ( new type of 4k to 1080 supersampling) MFAA (faster new method in using AA vs MSAA) and new compression method to save memory bandwidth, better latency with VR. They kept on talking about how maxwell is 2x better then GTX 680 when in fact when compared to 780 series is not so special. The show is meant to wow you and they used vague examples and terms through out show case. Besides these features, they are not introducing a gpu series with mind blowing performance compared to 780's.
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