Here's a table with the detailed test results:
Now we can take a look at our comparative summary diagrams.
First of all, let’s see how much faster the new GeForce GTX 660 Ti is compared to the previous-generation mainstream card GeForce GTX 560 Ti 448 Cores. Of course, it would have been better to take an ordinary GTX 660 Ti (the 448 Cores version is closer to the GTX 570) but we didn't have one at hand. Anyway, here are the results:
So the GTX 660 Ti is an average 31-35% faster at 1920x1080 and 38-44% faster at 2560x1440. The maximum gap (over 100%) can be observed in Metro 2033 at certain settings, yet the new card also enjoys a huge advantage in such games as Total War: Shogun 2, Battlefield 3, Batman: Arkham City, Lost Planet 2 and S.T.A.L.K.E.R.: Call of Pripyat, and also in 3DMark 2011. Take note of the fact that the GeForce GTX 660 Ti enjoys a larger advantage over the GeForce GTX 560 Ti 448 Cores with antialiasing turned off rather than on. It is easy to explain. The fast GPU of the newer card is just limited by its 192-bit memory bus whereas the GeForce GTX 560 Ti 448 Cores, on the contrary, has a slower GPU but its 320-bit bus is better suited for heavier graphics loads.
The next pair of diagrams compares the GeForce GTX 670 with the GTX 660 Ti. Let's see the gap between the new product and its higher-class cousin.
The gap is actually not very large. The GTX 660 Ti is an average 13-19% slower than the GTX 670 at 1920x1080 and 15-23% slower at 2560x1440. That’s not much considering that the GTX 670 costs 33% more. The effect of the narrow bus can be seen again, by the way: the gap is wider when antialiasing is turned on.
Now let’s see if this gap can be bridged by overclocking the GeForce GTX 660 Ti to 1063/7168 MHz.
Indeed, the two cards are comparable now except in Sid Meier’s Civilization V where the GTX 670 still enjoys a large advantage. So, if you’re into overclocking, you may want to buy a new GTX 660 Ti (after its price stabilizes) instead of a GTX 670.
Now that we know the position of the GeForce GTX 660 Ti in Nvidia's product line-up, let's check out its standing relative to AMD solutions. First goes the Radeon HD 7870 GHz Edition which has the same recommended price as the GeForce GTX 660 Ti.
They are identical in price but not in performance. The Radeon HD 7870 GHz Edition wins in DiRT Showdown, Sniper Elite V2 and (at the heavier settings) in Metro 2033: The Last Refuge, Aliens vs. Predator (2010), Sid Meier's Civilization V and Batman: Arkham City. But the rest of the games and benchmarks are won by the GeForce GTX 660 Ti. The latter is an average 12-17% faster at 1920x1080 and 6-13% faster at 2560x1440. That’s good but only if the GTX 660 Ti costs as much as the Radeon HD 7870 GHz Edition costs now.
Because if the GeForce GTX 660 Ti hits the market at a higher retail price, it will have to compete with the Radeon HD 7950 with the following outcome:
The Radeon HD 7950 improves AMD's position even more in the games where the Radeon HD 7870 GHz Edition was superior and adds a win in Crysis 2 to that. The other tests are still won by the GeForce GTX 660 Ti, but by a smaller margin. Mathematically, the Radeon HD 7950 is faster than the GeForce GTX 660 Ti across all the tests (by -2 to +6% at 1920x1080 and by 5 to 14% at 2560x1440).
As we wrote in the test methods section, AMD has prepared to meet the GeForce GTX 660 Ti release by updating the Radeon HD 7950’s BIOS and increasing the latter’s GPU clock rate by 125 MHz. With the new BIOS the Radeon HD 7950 is clearly better than the GeForce GTX 660 Ti.
Well, the last pair of diagrams is too provocative to comment upon. The GeForce GTX 660 Ti overclocks well, too, and the Radeon HD 7950 itself can easily reach higher clock rates than those of the new BIOS.