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iRun26.2

macrumors 68000
Original poster
Aug 15, 2010
1,931
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On this forum I've read about some people considering moving from the 2019 16" to the 2020 13" just to reduce the temperature / fan speed when using an external monitor (not in 'clamshell' mode). I temporarily have both in my possession so I decided to do a test related to this topic:

1) I Charged up both computer's batteries, exited all programs (just the Finder was open), and put them to sleep for a while to let them cool.
2) I then took them out of sleep, having them active using only the built in display for roughly 10 minutes (computer doing nothing, just 'on').
3) I used iStat Menus to measure the core temperature (1st temperature below).
4) I then plugged in my 32" LG 4K monitor (set to full 4K resolution via scaling) leaving the built-in display on ('on' but unusable at 4K).
5) After another 10 minutes I again used iStat Menus to measure the (stabilized) new core temperature and also the fan speed.

This is what I found:

2020 13" 10th gen i7: 35C to 45C (fans reported 0 rpm)
2019 16" 9th gen i9: 39C to 65C (fans reported ~2000 rpm)

(I am keeping the 2020 13" 10th gen. i7 and sending back the 2019 16: 9th gen. i9)
 
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Alexander William

macrumors 6502
Apr 18, 2020
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129
yep I’ve mentioned this on apples fan noise thread but keep getting instantly nodded and censored, Apple is obviously trying to avoid a recall or major issue with this 16”
 
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bomby0

macrumors member
Nov 7, 2014
53
114
Yeesh that temperature difference is dramatic. Thanks for the side by side testing!

That dGPU is really screwing things up for people who use external monitors.
 
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Anonymous Freak

macrumors 603
Dec 12, 2002
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How much warmer is the machine when you plug all three of them in?

It definitely runs a little warmer, but not so much that the fans are audible. (At least in standard "desktop application" use. Obviously things like games or video editing spike, but they'd do that even with just the internal display.) I'll do some more scientific-like testing this evening.
 
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iRun26.2

macrumors 68000
Original poster
Aug 15, 2010
1,931
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It definitely runs a little warmer, but not so much that the fans are audible. (At least in standard "desktop application" use. Obviously things like games or video editing spike, but they'd do that even with just the internal display.) I'll do some more scientific-like testing this evening.
Do you have iStat Menus? I’d really like to know the temperature.
 
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Grohowiak

macrumors 6502a
Nov 14, 2012
563
536
Have fun:
 
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Anonymous Freak

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Dec 12, 2002
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Do you have iStat Menus? I’d really like to know the temperature.
That's what I use.

Oh, hey, look, I responded in the thread Grohowiak linked:

 
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iRun26.2

macrumors 68000
Original poster
Aug 15, 2010
1,931
156
Have fun:
Like I could have possibly missed that thread on this forum! :) It can be overwhelming...

This is one instance where the integrate (Intel) graphics has a positive advantage (one of the reasons I chose the 13" over the 16").
 
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Anonymous Freak

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Dec 12, 2002
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Do you have iStat Menus? I’d really like to know the temperature.

Here you go, at idle, CPU 70°C, GPU 68°C, fans at 1800ish RPM, in lid-closed mode, with three 4K/60 displays at non-2x scaling. (which is more GPU-intensive than operating at "Default" which is "Looks like 1920x1080" exact integer scaling.)

This is my normal. Lid-open temps and fans are slightly lower due to better airflow, even though there's then a fourth display operating.

Heck, while typing this, temps have dropped to 65°F CPU/63°F GPU, although fans spun up to barely-audible 2500 RPM.
 

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applesed

macrumors 6502
Jun 25, 2012
257
107
Here you go, at idle, CPU 70°C, GPU 68°C, fans at 1800ish RPM, in lid-closed mode, with three 4K/60 displays at non-2x scaling. (which is more GPU-intensive than operating at "Default" which is "Looks like 1920x1080" exact integer scaling.)

This is my normal. Lid-open temps and fans are slightly lower due to better airflow, even though there's then a fourth display operating.

Heck, while typing this, temps have dropped to 65°F CPU/63°F GPU, although fans spun up to barely-audible 2500 RPM.

What type and vendor are the monitors?
With all this variation between temps I wonder if the monitor plays a role.
 
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magbarn

macrumors 68020
Oct 25, 2008
2,491
1,636
Here you go, at idle, CPU 70°C, GPU 68°C, fans at 1800ish RPM, in lid-closed mode, with three 4K/60 displays at non-2x scaling. (which is more GPU-intensive than operating at "Default" which is "Looks like 1920x1080" exact integer scaling.)

This is my normal. Lid-open temps and fans are slightly lower due to better airflow, even though there's then a fourth display operating.

Heck, while typing this, temps have dropped to 65°F CPU/63°F GPU, although fans spun up to barely-audible 2500 RPM.
Your dgpu is pulling 21 watts in your pics. It’s not too bad if my room is cooled down to 70F and I’m not doing anything too intensive. The problem is using high powered apps and you’re already preheating the chassis with that stupid 18-21 watt gpu idle power usage while taking away heat and power budget from the cpu. If the drivers or hardware were working properly it should only be using 5-7 watts on idle like my MacBook Pro 15 does when hooked up to an external monitor.
 
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Fuchal

macrumors 68030
Sep 30, 2003
2,508
783
It definitely runs a little warmer, but not so much that the fans are audible. (At least in standard "desktop application" use. Obviously things like games or video editing spike, but they'd do that even with just the internal display.) I'll do some more scientific-like testing this evening.

I see similar results. I run a 16" in clamshell mode with a 4K LG monitor and it runs considerably quieter than the 2015 15" it replaced.
 
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Anonymous Freak

macrumors 603
Dec 12, 2002
5,418
864
Cascadia
What type and vendor are the monitors?
With all this variation between temps I wonder if the monitor plays a role.

Brand of monitor shouldn't matter at all. They're all Samsung UE590 displays - one 24", two 28". Resolution and "looks like" setting are the important things. If you run them all in "native" - or "looks like" half their real resolution, it will be less GPU intensive than running it at non-native resolutions like I do.
 
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