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MP 7,1 RTX 2080Ti on Mac Pro (2019) works on Pro display XDR?

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gerrard0804

macrumors regular
Original poster
Sep 12, 2010
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has anyone tried N cards on Mac Pro (2019) for gaming on bootcamp? Watched review on youtube saying thunderbolt 3 not work from MPX module for Pro display XDR, only the display port from N card,, Is it a driver issue? what a waste that it cannot display on the XDR display

this videos tried GTX1080ti , but only display port works
 
gerrard0804 said:
has anyone tried N cards on Mac Pro (2019) for gaming on bootcamp? Watched review on youtube saying thunderbolt 3 not work from MPX module for Pro display XDR, only the display port from N card,, Is it a driver issue? what a waste that it cannot display on the XDR display

this videos tried GTX1080ti , but only display port works
Click to expand...

The XDR is a Thunderbolt display, not a Displayport display. Nvidia AFAIK doesn't have Thunderbolt, not just Type-C, ports on their GPUs. So you won't be able to plug the XDR directly into the card.

Without the MPX tab video return path, it won't be able to plumb its video output back into the thunderbolt bus, to go out over the IO card's TB ports into the XDR.

Theoretically, they might be able to make a tiny little add in card / dongle that plugs into the MPX slot, that offers loopback to their normal GPUs. Or, use one of the existing TB3 PCI cards that mix Displayport back into a TB3 output.

It's a lot of effort given Windows can make correct use of something like the Dell 8k display, or probably get more accurate / predictable results than the XDR on EIZO's 4k DCI display.
 
mattspace said:
Or, use one of the existing TB3 PCI cards that mix Displayport back into a TB3 output.
Click to expand...
Yes, For 6K, connect two DisplayPort 1.4 outputs from the Nvidia to a GC-TITAN RIDGE Thunderbolt 3 add-in card. Then connect the XDR to the GC-TITAN RIDGE. It works with the LG UltraFine 5K.

For 4K, connect a USB-C cable between the RTX card's USB-C output and the XDR display. This also works with the iPad Pro and MacBook which don't have Thunderbolt.
https://twitter.com/x/status/1206645916666449922
 
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mattspace said:
that is really surprising - i stand corrected. I'd have to assume the RTX's VirtualLink port can also function as a USB3 Displaylink connection as well.
Click to expand...
The VirtualLink port can be used for USB and DisplayPort 1.4 and VirtualLink. It supports USB 2.0 and USB 3.1 up to gen 2.

USB-C with DisplayPort alt mode has two options:
USB 2.0 plus four lanes of DisplayPort (like used by 4K USB-C displays like the LG UltraFine 4K).
USB 3.x plus two lanes of DisplayPort (like used in most USB-C docks).

VirtualLink alt mode is similar to DisplayPort alt mode but supports four lanes of DisplayPort 1.4 with USB 3.1 gen 2 on the USB 2.0 lines (requires a VirtualLink cable that has better shielding to support the faster rate).

DisplayLink is USB only. It does not matter what USB 3.1 gen 2 port you connect it to. Connecting a DisplayLink adapter to the USB-C port of the RTX card does not give better performance than connecting it to some other USB 3.1 gen 2 port (I suppose the RTX card might have a better USB controller (10 Gbps) than the Asmedia ASM1142 (8 Gbps) - I don't know how it compares to the USB of Thunderbolt 3). Does anything actually use VirtualLink?
 
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Krevnik said:
Its meant for VR, but without AMD shipping cards with it yet, I don’t think Occulus/Vive support it yet.
Click to expand...

"not enough bandwidth" is what I've heard a few folks in the VR world say about VirtualLink - it's sounding a bit like Thunderbolt, in that HMD makers will upscale the density of their displays, faster than VirtualLink can/will rev their Displayport version, so they're not adopting it. Sticking with a multi-tailed cable at the computer end (or both ends), the headset makers get to avoid being at the mercy of some other industry group.
 
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Krevnik said:
Its meant for VR, but without AMD shipping cards with it yet, I don’t think Occulus/Vive support it yet.
Click to expand...
There's this adapter at https://www.bizlinktech.com/products/detail/1332/VirtualLink™+Interface+Adapter
which could solve that if it were a real product (I don't think it is - no one is making it).

mattspace said:
"not enough bandwidth" is what I've heard a few folks in the VR world say about VirtualLink - it's sounding a bit like Thunderbolt, in that HMD makers will upscale the density of their displays, faster than VirtualLink can/will rev their Displayport version, so they're not adopting it. Sticking with a multi-tailed cable at the computer end (or both ends), the headset makers get to avoid being at the mercy of some other industry group.
Click to expand...
So DisplayPort 1.4 and USB 3.1 gen 2 aren't enough? What headset is using more than that? What are they using? Dual DisplayPort? DisplayPort 2.0? HDMI 2.1?
 
joevt said:
There's this adapter at https://www.bizlinktech.com/products/detail/1332/VirtualLink™+Interface+Adapter
which could solve that if it were a real product (I don't think it is - no one is making it).


So DisplayPort 1.4 and USB 3.1 gen 2 aren't enough? What headset is using more than that? What are they using? Dual DisplayPort? DisplayPort 2.0? HDMI 2.1?
Click to expand...

well just like Thunderbolt has traditionally been a whole version behind on Displayport version, i imagine there's a suspicion that VirtualLink will do the same thing if it becomes a standard - it's effectively a middleman between the display and the GPU, that can be solved just as easily by physically bundling two cables in a single cover.
 
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mattspace said:
well just like Thunderbolt has traditionally been a whole version behind on Displayport version, i imagine there's a suspicion that VirtualLink will do the same thing if it becomes a standard - it's effectively a middleman between the display and the GPU, that can be solved just as easily by physically bundling two cables in a single cover.
Click to expand...

That's kinda what VirtualLink does though. Just electrically instead of mechanically. But there's still headroom in DP 1.4 and VR hardware. But at this point, the GPU itself is part of the bottleneck.

I'd imagine that you can also migrate wholesale to DP 2.0 though. Since DP 2.0 itself is effectively a superset of VirtualLink and uses the USB-C connector in yet another DisplayPort-focused alt mode. So VirtualLink doesn't need to incorporate 2.0 support per se. And since you have to use USB-C for DisplayPort 2.0, you might as well let your USB 3 signals run along the cable at that point.

But yes, if you build one standard on another, you will lag behind, that's effectively a given. In the case of Thunderbolt 3 though, it was mostly that the controller chips for 1.4 didn't exist for about a year after 1.4-compatible GPUs appeared. Not that TB3 itself needed revisions to handle it.
 
It seems to work. HBR2 6K 12bpc using DSC.
forums.macrumors.com

Apple's Pro Display XDR on one Nvidia 2080 Ti thru the Gigabyte Titan Ridge add-in card

Hi there, I'm wondering if I can drive an Apple's Pro Display XDR with a single Nvidia 2080 Ti hooked thru the Gigabyte Titan Ridge add-in card? I currently have two LG UltraFine 4K (2019) monitors working in this setup. Also, the video output for the nVidia card (see tech spec page) lists a...
forums.macrumors.com forums.macrumors.com
 
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