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eGPU "disconnects" itself suddenly
 

eGPU "disconnects" itself suddenly  

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rmvz3
(@rmvz3)
Trusted Member
Joined: 3 years ago
 

Hi there.

I have an Akitio Thunder2 with a 1070 and a Thunderbolt 1 Macbook Pro retina 15" (early 2013, the one with the GT650M). I have a Cinema Display 27" as external monitor and keep the laptop screen off (through the screens configuration in windows preferences).  I use the eGPU mainly for VR with my HTC Vive and everything used to work perfectly until a few days ago.

Now, sometimes, suddenly my screen goes black (but I still have sound) and after a few seconds the macbook screen switch on and Windows keeps running normally (the game window is black, obviously). Is like somebody unplugged the thunderbolt cable from the mac. The egpu PSU and fans keep working but it looses connection. Today I have experienced the same behavior with a normal (non VR) game so at least I can discard the Vive.

Anyone has had any similar problem? Could it be a eGPU power lack, overheating or what? How could I identify the source of the problem. I've discovered there are a few programs that always trigger the blackout (e.g. Google Earth VR). Please help.

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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mac_editor
(@mac_editor)
Famed Member Moderator
Joined: 3 years ago
 

I am facing a similar issue - with the eGPU suddenly seemingly disconnecting on high load. I replaced the PSU (Akitio Node) and it worked flawlessly for awhile until it happened again. Waiting on a replacement PSU to eliminate PSU as a cause once and for all if that's the case.

purge-wrangler.shpurge-nvda.shset-eGPU.shautomate-eGPU EFI Installer
2018 MacBook Pro 15" RP560X + RX 5700 XT (Mantiz Venus)


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rmvz3
(@rmvz3)
Trusted Member
Joined: 3 years ago
 

Well, it's true that my PC PSU is the cheapest I could buy but it should be enough. I've tried using the PC PSU just for the card an using the Akitio PSU for the box but it still happens. Please let me know if you have success upgrading the PSU

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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rmvz3
(@rmvz3)
Trusted Member
Joined: 3 years ago
 

I can confirm it was a PSU issue. I've replaced my old cheap generic one with a Corsair CX 750W and now everything works like a charm. I hope this helps somebody.

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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mac_editor
(@mac_editor)
Famed Member Moderator
Joined: 3 years ago
 
Posted by: rmvz3

I can confirm it was a PSU issue. I've replaced my old cheap generic one with a Corsair CX 750W and now everything works like a charm. I hope this helps somebody.

Glad you figured it out... I'm waiting on both MSI and Akitio (have sent them the components) to work on my GPU + PCB... I'm essentially eliminating everything that might be an issue lol... 

purge-wrangler.shpurge-nvda.shset-eGPU.shautomate-eGPU EFI Installer
2018 MacBook Pro 15" RP560X + RX 5700 XT (Mantiz Venus)


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pizzacat
(@pizzacat)
Active Member
Joined: 2 years ago
 

I have the same setup (Akitio Thunder 2) and figured out the cause of this issue.

After a thousands of hours of using the eGPU without any issues, it started to suddenly crash under heavy load. This started to happen after transporting the eGPU so I thought I might've damaged it. 

Turns out, the issue was caused by a loose molex-to-barrel connector. I solved it by pulling the cable tight then taping it down to ensure a good connection between the barrel connector and the female plug (on the Akitio). 

This was 100% the cause of the issue. I tested it with and without the fix and it failed every time under load without the tape.

I can post a picture if anyone is interested. 

If you encounter this issue (crash under load) try this fix before buying a new PSU! 

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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Jyin
 Jyin
(@jyin)
Estimable Member
Joined: 2 years ago
 

I have the same problem. But I am pretty sure my problem is thermal.
The Vega FE/LC gets pretty hot, I almost burned my finger touching the gold shroud of the GUP today.

I did have the same symptom with the stock PSU, but that was due on to overloading.

You can tell the difference. The overloading issue is reproducible. Run the same task, and there’s a good chance it will fail every time. The thermal issue is harder to replicate, but cheap IR thermometer will help getting some idea.

I’ve mounted an 92mm fan inside of case blowing at the chip on the Vega. Hopfly that is enough. 

J

2017 iMac 5k 27inch RP580 TB3 + Vega FE/LC + Sonnet 550 + EVGA GeForce RTX 2080 Ti FTW3 ULTRA GAMING + Sonnet 550 + Mac/Win10


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