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Lots of trouble, when we look at the time spent on long-latency frames. What happened to the GTX 680? Well, look up at the plots above, and you'll see that, very early in our test run, there was a frame that took nearly 180 ms to produce—nearly a fifth of a second. As we played the game, we experienced this wait as a brief but total interruption in gameplay. That stutter, plus a few other shorter ones, contributed to the 680's poor showing here. Turns out we ran into this problem with the GTX 680 in four of our five test runs, each time early in the run and each time lasting about 180 ms. Nvidia tells us the slowdown is the result of a problem with its GPU Boost mechanism that will be fixed in an upcoming driver update.
http://techreport.com/articles.x/22653/9