High Sierra Unable to Detect RX Vega 56 with HP Omen Accelerator
 
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High Sierra Unable to Detect RX Vega 56 with HP Omen Accelerator  

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whitesin
(@whitesin)
New Member
Joined: 3 years ago
 

Hey, all.

I've been reading couple posts in this forum and decided to go for RX Vega 56 card since its native support in macOS 10.13. For enclosure, I chose HP Omen Accelerator. Today I received both of them and wanted to give it a try... so I inserted the card into the PCIe slot, connected to PSU, and connected to my mbp 2016 15' with tb3 cable.

And then nothing happened...no message saying "external graphics card detected". It still shows "Radeon Pro 450" in About My Mac. However it did detect the enclosure in system report under thunderbolt. 

The "RADEON" red light on the card is on, but the fan is not spinning. Also the Omen Accelerator box comes with a 6 + 8-pin power cable and on VEGA 56 card there are two 8-pins slots. Could this be the case, due to insufficient pins?

 

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
 

You need a PCIe 6-pin to 8-pin adapter to power the RX Vega 56 properly. 

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2020 15" HP Spectre X360 [11th,4C,G] + RTX 2080 Ti @ 32Gbps-TB4 (AORUS Gaming Box) + Win10 2004 [build link]  


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Sky11
(@sky11)
Reputable Member
Joined: 4 years ago
 

Please get a decent ATX power supply -  you should be able to find a decent 750W ATX power supply - make sure it has a single 12V rail. Newegg has literally more than 100 750W PSUs , for example EVGA SuperNOVA 750 G2 220-G2-0750-XR 80+ GOLD 750W

Unfortunately HP's choice of the power supply automatically excludes any Vega support (why you think it is so cheap comparing to other eGPUs?)

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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whitesin
(@whitesin)
New Member
Joined: 3 years ago
 

Thanks, your suggestion works. But will this undermine the performance?

Is it fine to power the card from a different PSU?

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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Yukikaze
(@yukikaze)
Prominent Member Moderator
Joined: 4 years ago
 

No, it is not. You need to use a single PSU for your setup.

Want to output [email protected] out of an old system on the cheap? Read here.
Give your Node Pro a second Thunderbolt3 controller for reliable peripherals by re-using a TB3 dock (~50$).

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2012 14" Lenovo Thinkpad T430s [3rd,2C,M] + RX 550 @ 10Gbps-TB1 (Atto Thunderlink) + Win10 [build link]  


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Naragato
(@naragato)
Active Member
Joined: 4 years ago
 
Posted by: Sky11

Please get a decent ATX power supply -  you should be able to find a decent 750W ATX power supply - make sure it has a single 12V rail. Newegg has literally more than 100 750W PSUs , for example EVGA SuperNOVA 750 G2 220-G2-0750-XR 80+ GOLD 750W

Unfortunately HP's choice of the power supply automatically excludes any Vega support (why you think it is so cheap comparing to other eGPUs?)

Over estimating how much is needed for the Vega 56.  It's max draw is 220w.  The 500w PSU in the omen is enough, even if you factor in the draw for the USB ports and power delivery, and consider that it's a bronze rated PSU, it leaves you with enough headroom to run a 220W (or 200 with the bios switched into the read only bios) GPU.  The fact it doesn't have the two 8 pin connectors is the only issue.

http://mailchi.mp/e6f8f339adcf/mantiz-venus-amd-vega-64. Mantiz running Vega 64. on a 550w PSU. Shock horror 😮

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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Sky11
(@sky11)
Reputable Member
Joined: 4 years ago
 
Posted by: Naragato

Over estimating how much is needed for the Vega 56.  It's max draw is 220w.  The 500w PSU in the omen is enough, even if you factor in the draw for the USB ports and power delivery, and consider that it's a bronze rated PSU, it leaves you with enough headroom to run a 220W (or 200 with the bios switched into the read only bios) GPU.  The fact it doesn't have the two 8 pin connectors is the only issue.

http://mailchi.mp/e6f8f339adcf/mantiz-venus-amd-vega-64. Mantiz running Vega 64. on a 550w PSU. Shock horror 😮

Here we go again. I already explained few times on this forum what is difference between what you call "max draw" and peak currents. You are saying that so called "500W" PSU in Omen is enough, based on your extensive testing with various loads? 

you cannot compare HP box to Mantiz - different designs, different power supply. Regarding Mantiz claims about Vega 64 - well, they are responsible for what they claim. They are not listed under supported hardware on AMD.com, nor any shipping eGFX box is approved for Vega64.

 

 

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
 

@Naragato, there's a reason the OMEN Accelerator has one 8-pin and one 6-pin PCIe power cable. Sure, under certain scenarios the RX Vega 56 may work with the 500W PSU in the OMEN Accelerator. That doesn't mean it will be sufficient for all types of use. 

external graphics card builds
best laptops for external GPU
eGPU enclosure buyer's guide

 
2020 15" HP Spectre X360 [11th,4C,G] + RTX 2080 Ti @ 32Gbps-TB4 (AORUS Gaming Box) + Win10 2004 [build link]  


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Chippy McChipset
(@chippy-mcchipset)
Reputable Member
Joined: 3 years ago
 

Reading some of these Vega threads, I'm curious: are those on Mac buying Vega RX 56 or 64 doing so for gaming purposes? Because according to gaming.radeon.com, the Vega RX series does not support OpenGL or OpenCL, should your intent be to use it for creative workflows. Or if it does, they don't list them for some reason (seems crazy not to even if it's not gaming-specific in the case of OpenCL).

Seems like only the Vega Pro WX 9100 card (so far) supports the various standards Mac users commonly need in those kind of 2D and 3D workflows. Not sure what happened to the Frontier Edition card, don't see it on their "pro" site but for sure it would support the same specs. Unfortunately the card itself does not support Mac (Windows only drivers for now?) so that would mean Boot Camp and using Windows versions of the apps. It does support quite a list for Mac and PC though and at a current level. Here are a few of them:

HDCP Support
OpenCL 2.0
OpenGL 4.5
Vulkan® API
DirectX® 12.1
5K Support (60Hz SST)
8K30 (Single-cable, Single Display)
8K60 (Dual-cable, Single Display)
 

Some interesting news on this front
https://www.anandtech.com/show/11968/now-shipping-radeon-pro-wx-9100-and-ssg-with-new-drivers  

Bring peace to your computing life: stop trying to understand Apple.


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Sky11
(@sky11)
Reputable Member
Joined: 4 years ago
 
Posted by: Chippy McChipset

Reading some of these Vega threads, I'm curious: are those on Mac buying Vega RX 56 or 64 doing so for gaming purposes? Because according to gaming.radeon.com, the Vega RX series does not support OpenGL or OpenCL, should your intent be to use it for creative workflows. Or if it does, they don't list them for some reason (seems crazy not to even if it's not gaming-specific in the case of OpenCL).

Seems like only the Vega Pro WX 9100 card (so far) supports the various standards Mac users commonly need in those kind of 2D and 3D workflows. Not sure what happened to the Frontier Edition card, don't see it on their "pro" site but for sure it would support the same specs. Unfortunately the card itself does not support Mac (Windows only drivers for now?) so that would mean Boot Camp and using Windows versions of the apps. It does support quite a list for Mac and PC though and at a current level. Here are a few of them:

HDCP Support
OpenCL 2.0
OpenGL 4.5
Vulkan® API
DirectX® 12.1
5K Support (60Hz SST)
8K30 (Single-cable, Single Display)
8K60 (Dual-cable, Single Display)
 

Some interesting news on this front
https://www.anandtech.com/show/11968/now-shipping-radeon-pro-wx-9100-and-ssg-with-new-drivers  

Official spec of Radeon Vega RX:

API support
Direct3D
OpenCL OpenCL 2.2
OpenGL OpenGL 4.6
Vulkan

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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