Just received my 680 today and was able to easily attain +185mhz and +100 memory with +132% power. It seems to perform nearly identical to my OC'd 7970 in Battlefield 3 when both are OC'd. My 7970 pulls ahead by a bit when both are at 1300mhz, but that is to be expected, as clock for clock, the 7970 performs better.
Either way, the card runs super cool, is super stable in BF3 at those clocks, and I don't have anything bad to say about it. Just simply because of the size of the card and how cool it runs, I'm thinking about going Tri or Quad SLi with it, like I did with my 7970s, and compare that. The SLI scaling for the 680s has been suspect as of late, but we'll see if driver updates fix it.
Also, unigine is the only thing that makes my card crash at these clocks, which is the same thing that happens to others. I played BF3 for over an hour and didn't have a single problem, but unigine for 10 mins caused a crash. Doesn't make sense to be honest. I could care less if it crashes in Unigine, as long as the clocks hold up in BF3, and they do
I'll be ordering another 680 as soon as newegg gets them back in stock. I'm not going to continue paying $565+ for my 680s as I did with this one, even though I like EVGA