Recently transferred my 95 minute TV drama stereo mix from HD3 Accel MacPro2.1 8 core 3GHz 12 GB RAM to a 2011 MacBookPro quadcore (8 cores seen in ProTools) 2.3 GHz 8GB RAM Metric Halo ULN-8. HD had 166 voices occupied, Sonnox or DMG audio EQ and compression in every track, 6 stereo Altiverbs, de-essers and so on, quicktime video. Everything runs smoothly on the MacBookPro, but the fan noise is unbearable for serious mixing, which disappointed me very much.