How different Macbook configurations perform with 4K 60Hz monitors? I would like to know the difference between 2015 Macbook Pro 15 with Iris Pro and AMD 370X. Additionally, it would be interesting to hear how 2016 models perform(and any other model for that matter). Some people say that the fans run constantly and noise is annoying. Other say that the performance is not smooth. So, the questions are as follows(assuming 4k monitor running at 60Hz and Macbook in clamshell mode, meaning it drives only the external monitor): 1. What is the exact model and configuration of the Macbook? 2. At what scaled resolution do you run MacOS? 3. How smooth is the MacOS? (gestures and overall performance under light and heavy load) 3. Are fans running constantly even on light tasks like browsing? If not, when they start to be annoying? 4. Is Macbook generating considerably more heat as opposed to standalone operation?