Thunderbolt ports not enough power
 
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Danny Fong
(@danny_fong)
Active Member
Joined: 2 months ago
 

Mac mini 2018 (2020). I have three devices that are powered from my Mac

egpu, an audio preamp, and an external thunderbolt ssd

sometimes I boot into windows and they all work together perfectly. Sometimes having even one additional device plugged in causes the egpu to disconnect. It’s really frustrating and I’m not sure how to get more power so my devices can just work together. All 3 are plugged directly into the Mac. 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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itsage
(@itsage)
Illustrious Member Admin
Joined: 4 years ago
 

@danny_fong, I find the 2018 Mac mini to struggle with multiple bus-powered Thunderbolt 3/USB-C devices. For example, if I connected a portable USB-C monitor and a TB3 SSD drive or UA Arrow interface to two ports of the same bus, one of them would occasionally experiences power reset. I make sure to keep them in separate buses to prevent this power issue.

 

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2020 14" MSI Prestige 14 EVO [11th,4C,G] + RTX 3080 @ 32Gbps-TB4 (AORUS Gaming Box) + Win10 2004 [build link]  


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Danny Fong
(@danny_fong)
Active Member
Joined: 2 months ago
 

That's what I've been doing, mostly with success. The EGPU in the far left port, Thunderbolt SSD in far right, and a Focusrite Preamp in the second to right (thinking that those two both take significantly less power). For the most part (including right now) this works, but sometimes (like last night after gaming for 3-4 hours) my eGPU would connect on bootup 50% of the time and if I plugged in even one additional device it would disconnect the egpu and revert to the igpu. I left it overnight and on boot in the morning everything worked as usual, leading me to believe that there was possibly an overheating issue from sustained use, but I don't have any idea.

I posted a separate thread as well but wondering if you know about why I'm unable to use the HDMI out on the razer core X to my monitor. If it takes too much bus power, or if maybe I need some updated thunderbolt drivers. Any insight?

Thank you for your commitment to this forum, your expertise is appreciated by so many!

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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