Everything from AMD/Ati 2k series up to the 5k series is based on the same underlying VLIW5 arch, but I haven't heard anyone say that AMD/Ati totally spanked Nvidia's G80 due to how awesome Cypress was, because that would be just plain stupid.
Not sure how this is relevant to G80 in context. Cypress was slower than GTX480/570/580, while G80 dominated 2900 and 3800 series entirely. Either way, his implication is obvious: why would Nvidia spend 2 years to launch a "high-end" Kepler (whatever the name will be GTX780/880, etc.) and then that card end up losing to the HD7970 that's just 25% faster than a GTX580? Doubtful.
How does that work exactly? The 680 driver inputs the wrong clockspeed? Huh?
Could be Nvidia locked out the full functionality until the launch date drivers.
Could be GTX680 is not as fast as predicted.
Could be user error (didn't activate some +20% TDP maximum boost / some other feature in the driver panel)
Food for thought: Why is 28nm GTX680 that's supposedly high-end Kepler clocked at 706 mhz when GTX580 was clocked at 772mhz on 40nm process? GTX680 also has lower ROP count, same memory bandwidth.
Any of these are possible:
1) NV flopped and abandoned the large die strategy, there is no GK110;
2) GTX670 --> GTX6
80 is like HD5870 --> HD6
870 (where the marketing name is not reflective of the true standing in the Kepler lineup)
3) Nvidia couldn't get the flagship out on time so they had to resort to using GTX680; GK110 will be GTX780. Perhaps the plan was always to counter HD7970 with a card +/-5% within HD7970 until they sort out whatever problems they are having with power, yields on the large die flagship.
4) Nvidia is loving the profit margins on a 294mm^2 chip. Milk the market/consumer. It seems consumers are eager to pay $550 for HD7970, why not pay $500 for GTX680?
5) Nvidia is having yield issues. It wouldn't' be feasible to get out GK110 right now at reasonable profit levels without pricing it at $800 (good luck with that).
Either way, looking more and more like this entire 28nm generation is lackluster. Even if GTX680 is 10% faster than HD7970, that's still not fast enough after 2 years since GTX480 (my opinion).