Just wished I had better control on AMD GPU being used whenever I plug in a display for my MBP16, just ramps up the fan for no reason while my Air is just sipping away on the same display with iGPU..
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#72Earlier quoted context omitted.
There is a fix coming for the 5500m heat/wattage issues in the next OS thankfully. The MacOS drivers for RDNA are apparently just crap. This problem wasn’t present on the Vega GPUs, and it isn’t present while booted into Windows. To think this lasted all the way through Catalina and Big Sur is insane.
Where did you read this? I'd love to know more. Do you know if this fix also applies to the 5300m?
I would also like to know that. AFAIK the 5500 has the same driver issue as the 5300, but even without a fix its baseline consumption with an external screen plugged in is about half of the 5530's.
Hopefully the fix applies to both models but I'm not holding my breath.
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#73Is this the 'high quality' Apple fan boys like to talk about?
No, I think they're referring to the pre-installed ads on the start menu. Oh wait, that's Microsoft. Or maybe it is the utter failure of a control panel (Bluetooth, ACPI, Audio) that is still a crash-fest with Focal Fossa. Let's face it, everything with a GUI now sucks. Hard.
More relevant today than when it was first recorded: https://www.youtube.com/watch?v=YRlPTbKHIPQ
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#74I tried this and it doesn't work. Turns out my MacBook was throttling to 30% due to overheating. This happens more frequently if you drive the GPU with an external monitor. Unfortunately the OS does nothing to notify you of overheating and throttling, which is an insanely stupid oversight by apple. I only found out because I noticed that the computer ran fine while running the AC, so I installed an app through Brew c…
> root cause
There is a bug for 5500M GPU that causes 18W sustained power draw with one external monitor. It should normally be 5W or so.
The throttling is due to your VRM chips overheating. There is no temp sensor for this exposed to the user.
The VRM chips have no cooling. The high GPU watt draw pushes the temps of the VRMs above their thermal limits with no cooling.
The solution is to put thermal pads on your VRMs to dissipate the heat to the backplate. Completely resolved my issue.
Disabling TurboBoost can also help. Running fans at max speed at all times too because Mac is slow to ramp them up when load increases.
Apparently the 5600M doesn’t have this issue and the 5500M bug is fixed in Monterey. But the thermal pad mod is still amazing. Apple couldn’t do it stock, because there are regulations about hot a backplate can get related to risk of burns.
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#75I tried this and it doesn't work. Turns out my MacBook was throttling to 30% due to overheating. This happens more frequently if you drive the GPU with an external monitor. Unfortunately the OS does nothing to notify you of overheating and throttling, which is an insanely stupid oversight by apple. I only found out because I noticed that the computer ran fine while running the AC, so I installed an app through Brew c…
Unfortunately this is a very common problem with basically all modern high-end laptops that have a macbook-like form factor (e.g. not bulky gaming laptops with lots of cooling & ventilation). It's just not physically possible to make a machine that combines high end power hungry hardware, adequate cooling for that hardware, and a compact form factor. It's very sad that this is such a widespread problem and that there…
> the only solution
Putting thermal pads on your VRMs and dissipating heat to the backplate works perfectly.
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#76I tried this and it doesn't work. Turns out my MacBook was throttling to 30% due to overheating. This happens more frequently if you drive the GPU with an external monitor. Unfortunately the OS does nothing to notify you of overheating and throttling, which is an insanely stupid oversight by apple. I only found out because I noticed that the computer ran fine while running the AC, so I installed an app through Brew c…
Unfortunately this is a very common problem with basically all modern high-end laptops that have a macbook-like form factor (e.g. not bulky gaming laptops with lots of cooling & ventilation). It's just not physically possible to make a machine that combines high end power hungry hardware, adequate cooling for that hardware, and a compact form factor. It's very sad that this is such a widespread problem and that there…
Or, potentially, buy an M1 MacBook since Apple’s ARM chips are much more power (and thus heat) efficient than Intel’s?
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#77My 2019 16-inch MacBook Pro (2.3ghz i9/64gb ram) becomes unusable with 2 of the LG 5k monitors plugged in (one on each side). Worst MacBook I have ever owned.
I concur, I have a similar setup. Most expensive computer I've ever owned. It just throttles at the drop of a hat. I worked through it all with the apple techs, jumped through hoops for many hours and provided detailed diagnostics. They dismissed me with "throttling is normal, there's no problem". In the real world, my 2017 MBP performed better just because it didn't throttle. Ridiculous. As for the supposed 'Low pow…
There are two kinds of throttling going on. CPU and VRM.
CPU is normal - prevents CPU temps going above 100C.
The issue is VRMs which have no cooling. And no public sensors.
The fix is to add thermal pads to your VRM chips to dissipate the heat to back plate. Entirely solves all throttling issues. Cleaning fans should help too.
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#78My 2019 16-inch MacBook Pro (2.3ghz i9/64gb ram) becomes unusable with 2 of the LG 5k monitors plugged in (one on each side). Worst MacBook I have ever owned.
The VRM thermal pad mod will fix all your issues.
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#79This answer keeps clogging up my results researching my high kernel_task issues. This answer being over enthusiastically given even after thermal throttling could reasonably be ruled out is one thing - but it seems like there’s also no real way to troubleshoot this type of issue (what sub-process is going wild?). Best I could find was a command to list the RAM usage of kernel modules.
In my experience, high kernel_task is mostly due to VRM throttling. Once I resolved that I never had any issues with it.
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#80Oh yes! My brand new macbook pro had been sitting at 300% kernel process usage ever since I bought it. I thought it was just ridiculously badly optimized. Why doesn’t the system inform you when it’s spinning it’s wheels with no work just to cool down it’s chassis?
Look up VRM thermal pad mod.