While running some benchmarks and trying out some games on a new late 2013 rMBP i noticed that the machine runs very quiet on heavy GPU usage, even for hours, but gets very loud after even a few seconds of 100% CPU load. Running Cinebench R11.5 the CPU core temps reach 100°C in a few seconds with the fans spinning up to 5000/4500 rpm (left/right) moments later. After the test the fans turn down as quickly. Is this normal behavior or might it be a bad paste job or something? This is my first Macbook and my first high-performance notebook in general.