What's more interesting about this statement is that Carmack himself has seemed pretty pro-Nvidia in the past and was even invited to Nvidia's Montreal developer event to talk about G-Sync and other game development topics. While G-Sync is still quite a promising technology and has very little to do with Tegra K1, it is interesting to see him so vocally talk about Nvidia's flagship SoC so negatively.
While Carmack's statements are a clear backlash to Nvidia's grandiose statements and claims, I think that we really have to wait and see what Tegra K1 will really have to offer. Sure, it has a powerful GPU, but the idea that it can compete with gaming consoles is hyperbole unless they can actually show it side by side running the same game. Nvidia's Kepler GPU is incredibly efficient and there is no doubt that they can probably get some mobile games optimized for it to look console-quality or better, but the comparisons are clearly going a bit overboard.
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