eGPU Overclock on Mac OS  

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(@zambrigo)
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July 11, 2018 9:09 pm  

Hi guys,

without using bootcamp, anyone knows how to overclock an eGPU on Mac OS?

Thanks!


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Jyin
 Jyin
(@jyin)
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July 12, 2018 3:44 am  

I patch the kext with a SoftPowerTable for my Vega.
I use only the modest clock up, but mainly to keep the GPU’s fan under control.

J


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damonhayhow
(@damonhayhow)
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August 15, 2018 2:19 am  

Can you please elaborate on how and what you did, @jyin

I have a vega 64 I want to slightly undervolt and reduce peak power draw to work in my core V2. The Vega mostly works but just breaches the power threshold of the Core when pushed.

2018 15" Macbook Pro I7 2.6 Ghz / 16Gb / 512 Gb / 560X. 2x LG Ultrafine 4K displays. Razer Core V2 eGPU, Radeon RX580, Sunnix UPD2018 Displayport adapter.


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Jyin
 Jyin
(@jyin)
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August 15, 2018 1:24 pm  
Posted by: damonhayhow

Can you please elaborate on how and what you did, @jyin

I have a vega 64 I want to slightly undervolt and reduce peak power draw to work in my core V2. The Vega mostly works but just breaches the power threshold of the Core when pushed.

You should replace the PSU with better one instead of messing with undervolting.
I ran into the same issue with my Sonnet 550.
I tried undervolting and it didn’t fix the problem completely. It didn’t even make it less. It simply added more instability.

My solution was better PSU (850w platinum) and better cooling.

J


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damonhayhow
(@damonhayhow)
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August 15, 2018 2:51 pm  

Oh ok. I presume you tried other settings to get your card to work in your sonnet 550? Is the kext just too limited in its options?

Is there not an option in the kext to limit peak power and/or peak turbo? AMD provides a stock low power mode in their wattman app under windows which does exactly that. It just doesn’t exist for Mac. 🙁

I would happily replace the psu if a a suitable PSU existed. Unfortunately there doesn’t seem to be one that will fit the Core V2? And I don’t want to buy the new Core X because it is over twice the size, and I’ve heard there are reliability issues. I would get the new Asus XG pro, except the adapter to run dual PSU’s doesn’t exist. 

I would even happily have a technician reroute 65W to the graphics card instead of being wasted on charging the laptop. But I don’t know if it’s possible or who can do it?

So im limited to modding the GPU bios, or the MacBooks kext. Obviously the kext is the easiest and safest option, if it can be done? Or are you saying nothing you tried worked with your sonnet 550?

2018 15" Macbook Pro I7 2.6 Ghz / 16Gb / 512 Gb / 560X. 2x LG Ultrafine 4K displays. Razer Core V2 eGPU, Radeon RX580, Sunnix UPD2018 Displayport adapter.


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Jyin
 Jyin
(@jyin)
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August 15, 2018 11:47 pm  

My GPU (Vega FE/LC) has lower power BIOS built in, and I tried that.
I also tried undervolting it under Bootcamp.
My Sonnet 550 automatically allocate the extra power to GPU when PD is not in use (I use iMac so this is the case).

Even all that, I couldn’t get it stable at sustained max load on the GPU.

My advice is, sell your Core, get Sonnet 550, and get bigger PSU to sit along side.

J


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damonhayhow
(@damonhayhow)
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August 16, 2018 1:49 am  

Thanks Jyin. That is really disappointing but I really appreciate the feedback and advice. Looks like a new eGPU box... or a Vega 56. 

Its so annoying when it can work under Windows.

2018 15" Macbook Pro I7 2.6 Ghz / 16Gb / 512 Gb / 560X. 2x LG Ultrafine 4K displays. Razer Core V2 eGPU, Radeon RX580, Sunnix UPD2018 Displayport adapter.


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damonhayhow
(@damonhayhow)
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August 16, 2018 3:43 am  

Jyin, in that image, are you running a second, separate PSU external to the Sonnet eGPU box? Because, if a second external PSU could supply extra power to the card via the 2x 6+2 power cables, I could do this with the Core V2.

Or did you pull out the internal PSU from the Sonnet enclosure? I could do that with the V2 also. It would certainly help make it quieter. 

2018 15" Macbook Pro I7 2.6 Ghz / 16Gb / 512 Gb / 560X. 2x LG Ultrafine 4K displays. Razer Core V2 eGPU, Radeon RX580, Sunnix UPD2018 Displayport adapter.


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Jyin
 Jyin
(@jyin)
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August 16, 2018 11:31 am  

I pulled out the OEM PSU. I did run 2x PSU for a little while and they worked fine. But once I got my current one with 850W, I saw no point on it.

The PSU you see is almost completely silent even under full load. The fan inside doesn’t even kick in.

I am not sure your Core V2 has standard ATX 24pin connectors. If it does, or you can find an adaptor, it might work. Or you can run tandem.

Be warned that the controll board does regulate the PSU. So, your second PSU does not benefit from this. Make sure you get the top quality one that can self-regulate. You will also need a ‘Power on test plug’ to even turn on the PSU with out controller. Some high-end PSU comes with one.

I had good luck with Seasonic and EVGA Platium series.

J


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