[geerlingguy]

I could get it to run stable at 1.2 GHz in open air. 1.4 required good forced air cooling and still was a little unstable. Someone got it to run at 1.5 GHz but it was a bit unstable at that clock (overvolt of 8).

Inside a case, it quickly heats up under load!

In all cases, the CPU frequency starts stepping down when the temp hits 80C, and on the default clock it will go to 800 MHz until the temp is 79C. If it reaches 85C, it will throttle severely, all the way down to 400 or 600 MHz, I believe, until the temps get back down to 84C.