At 3.8Ghz with 1.5V and "Auto Xpress" and "CPU Tweak" on, I haven't seen anything over 50*C yet under full load, and it idles at about 36*C. This cooler is wicked! I use Core Temp for my readings. It seems to be the most accurate.just out of curiosity what were your temps at for your benches killswitch?
I only run those settings for benches though. I'm usually running the CPU at 3.7Ghz with 1.475V and those other 2 features off for even better temps and more stability.