2017 MacBook Pro overheating with external display

> They are not designed to be used for the same heavy tasks without proper cooling.

I agree. And I never complained that my MacBook Air (or iMac) got hot when compiling software or transcoding video or doing other intensive tasks. I expect that. Where we are (it seems to me) in disagreement is the definition of "heavy tasks". I can't agree that using an external 2560x1440 pixel display and using a browser is a heavy task for a 1800+ EUR computer.

I don't know if you've tried having your hands on 40+ C surface for more than 30 minutes, but I can tell you it is not pleasant. The representatives in the Apple store (where I was today, buying a new HooToo adapter, keyboard and mouse) confirmed that the 2017 MacBook Pro models "run hotter" than 2016 models (whatever that means, really).

IMHO, Apple poorly engineered cooling of this device for (some of) it's expected usage patterns. When not connected to an external display, it is really pleasant to use.

So, in order to use the computer for its intended purpose without uncomfortable heat from it's body, I just purchased an additional keyboard and mouse.

I appreciate your assistance in this matter.

Sincerelly,

Miha.

Kappy,

the only temperature that is (in my opinion) not normal is the temperature of the chassis of the MacBook; I have my hands on it and it is definitely too hot.

If I unplug the external monitor, the temperature drops to "normal" levels where heat is not an issue. Same apps, so I assume no runaway processes, since the difference is a connected external display (I don't think external process creates runaway processes).

Kind regards, Miha.

Kappy,

I believe I understand what you're saying. It seems to me, that we're talking about two different aspects though. You're talking about temperatures in general and that the temperatures are not on the "high" side and that it is normal for the computer to get hot, if you're using it. I respectuflly disagree. I believe internal temperatures are not problematic (my previous MacBook Air would get to 99 deg C on the CPU, but the computer's chassis were not as hot as this MacBooks when mostly idling). My colleagues MacBook Pro (2016 model) does not as hot when connected to two external monitors.

The 'problem', in my opinion, is that the heat, dissipated through the chassis of the computer is simply too much and that prevents comfortable use of the computer under normal and expected situations. In other words, I don't think connecting an external monitor should increase the the chassis temperature to levels which are not comfortable.

I assume the iStat Menus author agrees with me -- if you look at the "skin" temperature, you will see that the "bar chart" is near it's maximum.

I don't think I should be resorting to special methods of cooling the computer's chassis under normal use in order to use it comfortably. And having hands on a 45 deg C aluminium chassis while using the computer is not comfortable in my opinion.

Given your answers and your overall experience, I assume there's nothing wrong with my MacBook -- it's apparently how it was designed. I'll try to find some aftermarket fan control software and try to configure it so they activate sooner.

Kind regards!

Kappy, I appreciate your expertise. I've been researching a bit more. Here's what I think is really happening:

1. The USB-C - HDMI converter I've been using was getting very hot. The heat was also transfering through the USB cable to the MacBook's body.

1. In addition to above, the Intel GPU is doing more work, so it is obviously getting warmer/hotter (you can see on the screenshot above, it is at 68 C).

1. In addition to that, the system controlled fan speed is too low (~1700 RPM) to allow for cooling when the skin temperature is rising over 40C.

I noticed that I can tolerate ~40C just fine, but 42C is not good for prolonged (more than 30 min) use. It gets annoying fast over 41C.

I replaced the mentioned USB-C to HDMI converter with a HooToo converter and that one is not getting as warm as the previous one. Also, the USB-C connector has much lower temperature than the previous one (so I guess heat transfer is not that much).

This didn't quite solve the heating issue, though.

I used iStat Menus to change the speed of the fan, so it is cooling more. With the fan speed set at ~5000 RPM, the skin temperature is around 39-40C with light use of computer (MS Word, browser -- 90% idle). I was even able to charge the computer, have it connected to the external display and use it with skin temp under 40C with the fan at its maximum speed.

IMHO, the cooling system of the MacBook Pro is not suited for "Pro" use --

at least not in a comfortable way. I believe this could easily be adjusted with an OS/firmware upgrade, so that he OS would turn the fan speed up when reaching skin temperature of 40C.

I will also give MacFanControl a try, to see if can automatically adjust the fan speed .