Thanar,
In fact I somewhat missed that temperature setting. Reducing the speed might in fact reduce the framerate down to a rather dissatisfying level, nevertheless, a lower framerate is way better than a crash or unresponsiveness. I'll experiment on that and talk about the results here.
Yesterday the 1,025V setting proved to be unstable under sustained heavy loads. I Increased to 1,050V and after a 12h test run in my normal living room ambience the system remained stable and not hotter than 75°C. I'll see if this increased temperature headroom will be sufficient for the real world.