Ok, using my previous post (clamshell) as a template with some extra's left out. This time Lid open.
The laptop is just sitting flat on the desk so no extra cooling as with a stand.
Some info:
- MBP 16" 2,3GHz i9, 32GB RAM, 5600M graphics.
- Lid open mode
- LG 34WK95U on a desk-mounted arm. Using the provided TB3 cable by LG.
- Resolution: 3360x1417 HiDPI(full 5k2k resolution is tiny! Very sharp looking though, but so is this)
- Mac standard scaled resolution in the Display settings pane, one to the right (more space)
- Wallpaper resolution: 3440 x 1440
- Connections:
- 1 port: TB3 cable for display/charging
- 1 port: TB3 (USB-C) to TB2 adapter --> TB2 to ethernet adapter (seriously, Apple. Double dongles for RJ45?)
- Both connected on the same side.
Temps/Power after a few minutes idle:
- CPU:
- 47°C proximity with cores dipping to around 48°C
- For reference:
- Idle without external monitor I've noticed so far is around 40°C
- Idle clamshell with external monitor was cores lowest also 40°C with the proximity the same 48ish °C.
- GPU:
- Radeon High Side 7.95W
- 5600M: 56°C, proximity 46-49°C
- Intel UHD 630: 47°C
- Thunderbolt Port:
- 60 - 65°C
- Same as clamshell
- Fans:
- Around 1770 RPM average all the time, quiet, unnoticeable.
- Left side higher by about 100RPM because TB3 ports connected on that side I assume.
- Same as clamshell
Note: This is Idle after a few minutes. Safari open with one tab (website), Messages open, Mail and Activity monitor open in the background. Also, I do have airconditioning in this room.
General/Performance
Everything feels quick and responsive. Same as with clamshell.
Typing this while playing a youtube video in the background tab for music (safari) cores are 54-58°C and Radeon high side continues to go back down to 7.95 with some short spikes with usage mostly keeping below 10W.
Conclusion: It definitely does not heat up significantly just by using an external display with lid open.
Attached: iStat sensor data just before opening this website with the apps open as mentioned above.
View attachment 945838