Just been running Handbrake for 3 hours constantly on the rMBP 2.3Ghz. The machine was even just sat on top of the sofa which is not the best surface for cooling effect 100% CPU for 3 hours Max CPU temperature is 93deg C. Pretty amazing cooling and the laptop is still very very quiet fan wise running at 5300RPM. An incredible improvement over previous generation cooling and noise. Well done Apple. Now should I replace the thermal paste. Seems unnecessary on the rMBP but needed to do it to get these temps. on the 2011 model.