Recently i acquired a mbp 14inch M4 with 24gb ram. I installed a BUNCH of audiosoftware in total silence but when i was re-analysing my 600gb music library with traktor4 pro, meanwhile also playing some music, it sounded like a jet engine. I do suspect traktor to be the culprit, not making adequate use of resources thus overusing some. My mac is elevated 30cm so that airflow can always do its thing. I was surprised about the noise my fancy new machine spat out. Never heard it since.