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How excited can you get about the sixth desktop bin of a GK104 die? Well, that all depends on whether you're looking to buy a new video card for around $250. Recall that Nvidia's GK104 chip has 8 SMXes and 4 memory channels, which left the video memory struggling to feed the GPU chip adequately. So far, we've seen:
GeForce GTX 680: 8 SMXes, 4 memory channels active
GeForce GTX 670: 7 SMXes, 4 memory channels active
GeForce GTX 660 Ti: 7 SMXes, 3 memory channels active
GeForce GTX 660 (OEM-only version): 6 SMXes, 3 memory channels active
GeForce GTX 770: 8 SMXes, 4 memory channels active, clocked higher than GTX 680
GeForce GTX 760: 6 SMXes, 4 memory channels active
Whether a GTX 760 or GTX 660 Ti is faster depends on whether you're constrained more by memory bandwidth/ROPs or shader/TMU performance. That the GTX 760 is faster in nearly all games pretty much confirms what we've long known: a lot of Kepler cards were short on memory bandwidth.
The new GTX 760 beats the older GTX 660 Ti in just about all games, and often by a lot. The GTX 660 Ti was never a good value for the money, but a faster GTX 760 that is now cheaper than it should hopefully end the constant Nvidia fanboy recommendations of the GTX 660 Ti. For obvious reasons, the new GTX 760 is slower than the older GTX 670.
But the big deal is not just that the GTX 760 has launched, but that it costs $250. For a long time now, if you went above a Radeon HD 7870 or GeForce GTX 660 at around $200, performance per dollar went way down. Now we can extend that limit upward to a $250 GeForce GTX 760.
AMD has long owned the $250-$300 market, with the Radeon HD 7870 XT (Sapphire's version) or MYST (PowerColor's version) at $250 and the Radeon HD 7950 Boost at $300. That ends today, with the GTX 760 clearly better than the former and arguably better than the latter, while clearly being cheaper than a 7950.
We'll see if AMD responds with price cuts as they did when the GTX 770 launched, but their ability to do so may be somewhat limited, as Tahiti cards (Radeon HD 7900 series) are more expensive to build than corresponding bins of GK104 cards. Unlike the previous three generations when AMD had a huge cost of production over Nvidia, GK104 has the cost advantage over Tahiti.