Hey,
so after having the m4 max for half a year I noticed some very odd behavior lately. I do a lot of LR Classic Raw exporting which relies heavily both on the CPU and GPU. I feel like in the early days of owning the device, even up until recently the fans would be noticeably spinning during these tasks, but lately I noticed that during export of large numbers of files, eventually only the efficiency cores would be working while all the performance cores are mostly sitting idle. The GPU also is capped at around 50-60%. It reminded me of the maxtech review video of the m4 macbook air, where they saw the exact same behavior due to heavy thermal throttling. So I decided to install an app to check on the temperature levels and fan speeds et voila: the fans are at 30%, not hearable, and the CPUs are at around 100°C. I then manually kicked in the fans to 80% and saw a MASSIVE performance boost.
Export 650 Sony Raws from LRC with the MacOS fan control: 13 minutes.
Export 650 Sony Raws from LRC with manual fan override: 7:34 mins.
So almost twice as fast!
How can that even be possible? Is my macbook broken, or did apple break the fan control with a recent software update?
Funny thing is, when I do something that relies on the GPU only, the fans do spin up by themselves immediately. It's as if when the cpu is involved, the system reads out the temperatures wrongly and doesnt realize it needs to kick up the fans.
/EDIT: When creating 1:1 previews in LRC, which is a CPU only task, all the P-cores are being utilized to the max and the fans DO spin up in fact. So this must be something in the code of LR itself, that it doesnt fully pull all power from the p-cores when it detects some thermal boundaries, therefore not forcing mac os to spin up the fans or so? Super weird!
Anybody else noticed this? This can't be normal? Especially since I'm pretty sure I could hear the fans work quite a bit during these exports in the past...
so after having the m4 max for half a year I noticed some very odd behavior lately. I do a lot of LR Classic Raw exporting which relies heavily both on the CPU and GPU. I feel like in the early days of owning the device, even up until recently the fans would be noticeably spinning during these tasks, but lately I noticed that during export of large numbers of files, eventually only the efficiency cores would be working while all the performance cores are mostly sitting idle. The GPU also is capped at around 50-60%. It reminded me of the maxtech review video of the m4 macbook air, where they saw the exact same behavior due to heavy thermal throttling. So I decided to install an app to check on the temperature levels and fan speeds et voila: the fans are at 30%, not hearable, and the CPUs are at around 100°C. I then manually kicked in the fans to 80% and saw a MASSIVE performance boost.
Export 650 Sony Raws from LRC with the MacOS fan control: 13 minutes.
Export 650 Sony Raws from LRC with manual fan override: 7:34 mins.
So almost twice as fast!
How can that even be possible? Is my macbook broken, or did apple break the fan control with a recent software update?
Funny thing is, when I do something that relies on the GPU only, the fans do spin up by themselves immediately. It's as if when the cpu is involved, the system reads out the temperatures wrongly and doesnt realize it needs to kick up the fans.
/EDIT: When creating 1:1 previews in LRC, which is a CPU only task, all the P-cores are being utilized to the max and the fans DO spin up in fact. So this must be something in the code of LR itself, that it doesnt fully pull all power from the p-cores when it detects some thermal boundaries, therefore not forcing mac os to spin up the fans or so? Super weird!
Anybody else noticed this? This can't be normal? Especially since I'm pretty sure I could hear the fans work quite a bit during these exports in the past...
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