MP 7,1 2019 Mac Pro GPU Questions - 580x with Vega 64

[rondocap]

I have a 2019 Mac Pro, with the W580x installed. I added a Vega 64 GPU, and am using an LG 5k Monitor via Thunderbolt.

The 580x defaults to the display gpu, is there any way I can change that to the Vega 64? The monitor has thunderbolt to the back of the Mac Pro. I know if I plug in an HDMI cable to the GPU, it defaults to the display GPU, but anyway I can do that and still use the thunderbolt connection?

Also, does it make a difference for which GPU is the display GPU when using FCPX or Resolve which take advantage of multi gpu? Would it be faster if the Vega 64 is the primary display GPU or won't matter?

 

[mattspace]

I have a 2019 Mac Pro, with the W580x installed. I added a Vega 64 GPU, and am using an LG 5k Monitor via Thunderbolt.

The 580x defaults to the display gpu, is there any way I can change that to the Vega 64? The monitor has thunderbolt to the back of the Mac Pro. I know if I plug in an HDMI cable to the GPU, it defaults to the display GPU, but anyway I can do that and still use the thunderbolt connection?

Also, does it make a difference for which GPU is the display GPU when using FCPX or Resolve which take advantage of multi gpu? Would it be faster if the Vega 64 is the primary display GPU or won't matter?

AFAIK:

So your monitor is thunderbolt, which requires a thunderbolt video-out. The only GPUs with thunderbolt video out (either from the GPU's ports, or via the built-in Thunderbolt ports) are MPX GPUs. Your PCI-only Vega 64 can only do display duty, when a monitor is plugged directly into it, and that monitor would have to be DP/HDMI.

The best you're going to get is the Vega-64 as a compute accelerator.

 

[flowrider]

^^^^Not really. I am using a TB LG monitor. I have run it with a bidirectional cable:

Monoprice Bidirectional USB Type-C to DisplayPort Cable - 4K@60Hz, Black, 6ft - Monoprice.com

No longer will you be limited by the direction of your cable! This Bidirectional USB-C? to DisplayPort? Cable allows you to connect your legacy DisplayPort devices to your newest USB-C enabled display

www.monoprice.com

And with this cable:

Belkin Charge and Sync Computer Connection Cable for HUAWEI VR Glass

Adapt HUAWEI VR Glass to connect with computer. Support DisplayPort high-speed transmission. Support HUAWEI VR Glass PC mode 3K 90Hz resolution. 4.5 meters in length, enjoy immersive VR games. 2 USB-A and 1 DisplayPort connet with PC, 1 USB-C port connects with Huawei VR Glass.

www.vmallworld.com

Lou

 

[mattspace]

^^^^Not really. I am using a TB LG monitor. I have run it with a bidirectional cable:
Lou

You can use those cables to drive a TB monitor from a GPU that only has DP outputs?

 

[flowrider]

^^^Yes, as I posted that's my setup. I'm currently running an Aorus RX5700XT.

Lou

 

[mattspace]

^^^Yes, as I posted that's my setup. I'm currently running an Aorus RX5700XT.

Lou

OK so that's something I hadn't realised - the LG5k will run at full 5k with a non-tb displayport (1.4?) signal as long as it's in a usb-c plug?