Bootcamp on MBP - Processor stuck at base frequency

mrciave

macrumors newbie
Original poster
Dec 6, 2016
4
1
New to the forum, so hello to everybody.

After months talking with Apple support and basically getting told to update the Bootcamp drivers, I'm still stuck with my problem.

Windows 10 on Bootcamp, 2018 MBP with i9-8950HK processor. High Performance plan running on power supply. When I run heavy processor calculations, processor throttles from the 4.5GHz when not doing anything, down to below the base frequency of 2.90GHz (sometimes even 2.2GHz) depending on temperature.

When the load gets lighter, going back towards the 4.5GHz.

But sometimes, processor gets stuck at the base frequency (2.90GHz), and then does not move anymore from there, independently from the load.

This makes it much slower for computation.

When asking again full load (parallel computation on all cores), I'm able to recover it and then turbo works normally again.

Anyone have any idea how to fix it?

Thanks a lot!
 

Chocomonsters

macrumors regular
May 22, 2007
138
22
I have same 2018 MBP 15 with i9. I too am experiencing a random stuck processor at the base frequency. It will fully boost up and run with expected thermal throttling on and off. But when heavy CPU load is finished, it will return to base or lower as expected. However, if new heavy CPU load is started, it fails to resume boosting even after it has cooled off. Only way to reset for me is to reboot.
 

mrciave

macrumors newbie
Original poster
Dec 6, 2016
4
1
OK so you're in a worse situation than mine. Did you ask help from Apple or Microsoft?

Honestly, I'd like to understand if it's faulty HW or just a SW bug. But so far Apple has been useless...
 

Chocomonsters

macrumors regular
May 22, 2007
138
22
OK so you're in a worse situation than mine. Did you ask help from Apple or Microsoft?

Honestly, I'd like to understand if it's faulty HW or just a SW bug. But so far Apple has been useless...
Obviously this does not happen under MacOS and not likely represents faulty HW. I assume it is related to T2 security chip with limited access to CPU.

AFAIK this is Intel CPU level issues, not MS Windows 10 issue. You can download and run Intel Extreme Tuning Utility to monitor. You will notice thermal throttling kicking in regularly during heavy CPU utilization, but rarely ever see power limit throttling or current limit throttling. With thermal throttling, it will return back back to max frequency. When it is stuck at 2.9 base frequency, it is not in response to thermal throttling. It is just random.