Throttled CPU performance when Thunderbolt 3 eGPU connected | Native Windows 10
 
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Throttled CPU performance when Thunderbolt 3 eGPU connected | Native Windows 10  

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James Knight
(@james_knight)
Active Member
Joined: 4 weeks ago
 

I have been racking my brain in trying to resolve this issue and at one point before my main board died and needed replacing everything was working. This was after a long week of Error Code 12 issues. That I have successfully identified the conflict and am now able to ensure stability of the eGPU working when I boot up.

So with my current issue I am not sure what is different. Apart from a fresh build of windows. All Firmware is brought up to date including drivers that I was using before.

The issue...

Whenever I go to load a game or place any type of strain whether that be something as simple as using an internet browser all more CPU cores lock at 0.40Ghz. Adjusting power plans changing power source types and sizes do not make a difference. Yet strangely and what baffles me more. Is that when just typing this thread or in notepad my clock speed will jump up to about 1.2Ghz per core. Yet as soon as I run a CPU stress test it rolls back to 0.40Ghz.

I know of one other user that has witnessed this on this forum but I am hoping that someone might be able to help me think out of the box and troubleshoot this or even better know the answer...

Note that my machine works perfectly fine when the eGPU is not connected.

CPU Throttled when pressured
System operating idle

 

 

 

 

Setup: Dell Latitude 7300 | i7-8665U | 32GB DDR4 | M2.sata 512GB |
iGPU: UHD 620 | eGPU: RX Vega 56 | Asus XG Station Pro | Thunderbolt 3 (15D9) : NVM 44.00


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James Knight
(@james_knight)
Active Member
Joined: 4 weeks ago
 

I am not sure if this will just end up going into the ether, but maybe someone will discover this thread and make use of the information to come and better find an actual solution instead of the work around I have found.

My issue outlined above is possibly related to the AMD Xconnect Technology playing with the Intel CPU Power management settings. I have been racking my brain for weeks and with nothing to lose I stumbled across installed Intel Extreme Tuning Utility. Although for my processor it seems like most options are locked off. However, when I log into Windows and load Intel XTU with my eGPU connected. It reported that my system's Turbo Boost Power Max is equal to 3W which means none of my processors go beyond 0.40Ghz due to Power Limit Throttling.

So far I have yet to find the actual automated fix. At this present moment in time. I have to log in and patiently load Intel XTU. Once it loads I set my Turbo Boost Power Max to 30W. As soon as I hit apply, all works back as I would expect. For me as I have set 30W in the past. This is what is shown when I load the application. So in order to get it to kick in I set it to 30.25W apply then back to 30W then apply.

I also match this on my Turbo Boost Short Power Max (Not really required but this keeps my Laptop from going beyond 90 Degrees Celsius). This works for me.

TDP Limitation

 

Setup: Dell Latitude 7300 | i7-8665U | 32GB DDR4 | M2.sata 512GB |
iGPU: UHD 620 | eGPU: RX Vega 56 | Asus XG Station Pro | Thunderbolt 3 (15D9) : NVM 44.00


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