Are there any eGPUS (besides Blackmagic) that can power the LG Ultrafine 5K?
 
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Are there any eGPUS (besides Blackmagic) that can power the LG Ultrafine 5K?  

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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 

@bigmikeuk, I'm not sure how well the Blackmagic behaves with a PC. You should check other builds that include the Blackmagic for more info.

As for bandwidth, only the LG UltraFine 5K will be connected to Thunderbolt. Bandwidth for 5K @ 60Hz 10 bpc = 5120 x 2880 x 60 x 30 = 26.54 Gbps (I don't know what a Color Depth Factor is - why is 16 bits only 1.8 times greater than 8 bits). The 38WN95C would be connected to an HDMI port, not Thunderbolt.

 

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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bigmikeuk
(@bigmikeuk)
Active Member
Joined: 2 months ago
 

@joevt,  Sorry, I was not meaning that I would connect the blackmagic to Win10 PC (as I am OK with the 2080ti that I have in there).

I would intend the Balckmagic to be used with MBP

So,

Posted by: @joevt

The 38WN95C would be connected to an HDMI port, not Thunderbolt.

But doesn't the whole lot (5k and 38WN95C's bandwith) need to come back to the MBP via the TB3 connection to the egpu (Blackmagic)?  or is it just a 1 way thing - e.g. MBP issues instructions to do something, and the egpu does all the work accellerating the graphics and all the bandwith goes between the egpu and the Monitors.  In which case, I get your answer in terms of TB bandwidth not being an issue, and the issue is just if the 580 in the Blackmagic can push out that many pixels effectively.

 

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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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 

@bigmikeuk, Right:

The DisplayPort signal comes from the GPU in the Black Magic over Thunderbolt to the LG UltraFine 5K. It does not come from the MBP or go to the MBP.

A HDMI signal comes directly from the GPU to the 38WN95C. It does not come from the MBP or go to the MBP.

The MBP may send instructions to draw a line or fill a shape or process some image data - it does not send video signals to the GPU so it requires less bandwidth to the GPU.

If the MBP tried to draw every pixel, you would see it slowly paint from the top to the bottom (maybe check scrolling in the linux grub boot loader - takes forever for each line to scroll on some computers). With 2D acceleration, the MBP would send an instruction to paint a box or scroll a line.

 

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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Noah
 Noah
(@noah)
New Member
Joined: 11 hours ago
 

I need your help guys, I have two Ultrafine 5K the first gen. and would like to connect them using egpu with macbook pro as mine is overheating, what is the best graphics card/setup to do that? shall i buy two egpus? like the blackmagicdesign ones that has thb3 out? does the moshi cable works with any graphics card and i will be able to connect both using one card or will face brightness control issues?

 

Appreciate your help

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
 

@noah, If your primary goal is to take the load off the dGPU of your MacBook Pro, the Blackmagic eGPU (RX 580) is the most logical option. You will only be able to power one of the two 5K UltraFine directly from the eGPU. With one less 5K monitor to handle, the dGPU should be less taxed. There are workarounds to power the 1st gen 5K UltraFine monitors using other eGPUs. It will take plenty of work and you may not get the same experience.

 

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2019 13" MacBook Pro [8th,4C,U] + RX 5600 XT @ 32Gbps-TB3 (VisionTek mini eGFX) + macOS 11 & Win10 2004 [build link]  


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