Any difference between the four DP/HDMI ports on a graphics card?
 
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Any difference between the four DP/HDMI ports on a graphics card?  

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PhotoJoseph
(@photojoseph)
Active Member
Joined: 10 months ago
 

I have a Radeon RX Vega 56 8 GB in a Thunderbolt 3 Razer Core X Chroma eGPU enclosure and have two questions about the graphics card (which may apply to any graphics card):

  1. This card has four ports on it; three DisplayPort and one HDMI. Is there any difference between these, or are they grouped in any way? For example on my Mac mini, the four thunderbolt 3 ports are actually two pairs on two buses, so I know to distribute my data load across the two busses. Is there such a thing on a graphics card?
  2. I don't know if it's the port, or just a maxing-out of the power, but it seems like if I connect three displays (two on DP and one on HDMI), as soon as that third (HDMI) display gets connected, I see stuttering in the graphics — even something as simple as dragging a window across the screen. Heck sometimes it's even just one DP and one HDMI that does it! All displays are 4K, running at either 4K or "looks like" scaled 4K. Am I asking two much from the card (I mean, it has four ports), or is it because one is HDMI, or is something else amis? 

Thanks for any thoughts, 

-Joseph 

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
 

@photojoseph, HDMI in macOS has always had more trouble than DisplayPort in my experience. Does that 3rd monitor have DisplayPort input? Can you try a different HDMI cable? The graphics card itself should not have any issues power three 4K monitors.

 

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PhotoJoseph
(@photojoseph)
Active Member
Joined: 10 months ago
 

@itsage, intresting. No, the additional monitor is HDMI only. I use it for a variety of things; sometimes it goes to a recorder (i.e. an ATOMOS), sometimes to an ATEM Mini. Sometimes mirrored, sometimes not. I have found that if I connect it to the HDMI on the Mac mini directly, that works better. I do have a DisplayPort to HDMI cable but it's too short to be used for any of these needs. 

Thanks for your input. Any thoughts on the whether it matters if displays are in ports 1, 2, or 3? i.e. are they on separate busses like the Thunderbolt ports, so a port 1+3 is better than a port 1+2 configuration? 

 

-Joseph 

 

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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