@ wakanabi I love my Gigabyte card too! I don't have mine clocked as high as yours- but only because I'm still not that knowledgeable about OC'ing, not stability issues. I'm using the Gigabyte OC GURU II program and just matched the settings HardOCP achieved during their review, since they used the same OC program and I just copied their results (1085 core, 1170 boost).
We have pretty similar systems (3570k 4.6Ghz w/ CM Hyper 212, Gigabyte Up4th, 16GB Vengeance ram @ 1947Ghz, Antec 902 case, SeaSonic X650 Gold)... only one game drives the card to 60 celcius, otherwise it stays around 50! My case fans are always set on low, too. This card is quiet, well built and a pleasure to look at. I'll have to do more research on OC'ing and see how much more performance I can get out of it, without wearing it out too fast.