I took this last month so I had a record of max temps. They are pretty high,but after all it is an Ivy. This is as high as I'm going with the speed. I was trying 5.0 Ghz and kept getting BSOD on boot even at 1.340V. I do not want to get into the 1.4V range,so this is where I stop. Even though these temps are fairly high,under normal (gaming stress) conditions I'll never see these kinds of temps ,so I'm confident 4.8 Ghz/1.288V will be just fine for quite some time.
BTW,I was trying to run CineBench and the Open GL test keeps giving me an error. Not sure if maybe having the latest Nvidia driver (310.90) may be the problem?