MP 7,1 Vega Duo + Vega II Solo, infinity fabric?

[Eyezestful]

I have been reading a lot in this forum and it has been super helpful. There is something however I am still a bit confused.

I am planning to use Three 6k Xdr Diplays and from my understanding of Apple’s support pages, a Vega II duo cannot run 3 of them. You either need to have two solos or two duos for this to be possible. Is this understanding correct?

If that is the case, would it be possible to buy a Vega II duo with the machine and then add a Vega II solo in the other MPX module? Would the infinity fabric work in this case with a Duo and a Solo? I can only see info about infinity fabric for two Vega II solos or two Vega II Duos.

Any help would be really appreciated! Thanks a lot!

 

[OkiRun]

I have been reading a lot in this forum and it has been super helpful. There is something however I am still a bit confused.

I am planning to use Three 6k Xdr Diplays and from my understanding of Apple’s support pages, a Vega II duo cannot run 3 of them. You either need to have two solos or two duos for this to be possible. Is this understanding correct?

If that is the case, would it be possible to buy a Vega II duo with the machine and then add a Vega II solo in the other MPX module? Would the infinity fabric work in this case with a Duo and a Solo? I can only see info about infinity fabric for two Vega II solos or two Vega II Duos.

Any help would be really appreciated! Thanks a lot!

The Pro Vega II Duo ~

Support for up to eight 4K displays, four 5K displays, or four Pro Display XDRs

 

[Eyezestful]

Thanks for your reply. That’s what it says on the tech specs page but not on the support page where the connections to the gpu are explained.

Please see link below and it clearly says that only 2 Xdr work with a pro Vega II duo. Apparently you can add 2x 5k but not a 3rd 6k xdr. Only two Vega duos seem to support additional xdr displays (up to 4).

https://support.apple.com/en-us/HT210392

If anyone has more info about this conflicting information from Apple, it would be great!
Thanks a lot!

 

[OkiRun]

I have been reading a lot in this forum and it has been super helpful. There is something however I am still a bit confused.

I am planning to use Three 6k Xdr Diplays and from my understanding of Apple’s support pages, a Vega II duo cannot run 3 of them. You either need to have two solos or two duos for this to be possible. Is this understanding correct?

If that is the case, would it be possible to buy a Vega II duo with the machine and then add a Vega II solo in the other MPX module? Would the infinity fabric work in this case with a Duo and a Solo? I can only see info about infinity fabric for two Vega II solos or two Vega II Duos.

Any help would be really appreciated! Thanks a lot!

I am thinking about adding a Vega II to my Vega II Duo... in order to have access to more Tb3 ports. It looks like none of the 7.1 GPUs are available for individual purchase at the moment.

 

[deconstruct60]

Thanks for your reply. That’s what it says on the tech specs page but not on the support page where the connections to the gpu are explained.

Please see link below and it clearly says that only 2 Xdr work with a pro Vega II duo. Apparently you can add 2x 5k but not a 3rd 6k xdr. Only two Vega duos seem to support additional xdr displays (up to 4).

https://support.apple.com/en-us/HT210392

I'm pretty sure that the support page for the Duo isn't strictly an enumeration of all XDR options. Just one. It doesn't make much sense at all that a card with two GPUs is stuck to the same limit as a card with just one. One GPU assigned to use the edges could drive two ( just like the one GPU version of the card). So if hooked even just two DisplayPort lanes from the "additional" GPU to the MPX lanes 3 and 4 for DisplayPort then that one GPU should be capable of driving one XDR all by itself.

I suspect a possible quirk here is that it only drives the top ports and Apple probably thinks that not many folks would want to use those to drive a 3rd XDR.

A more reasonable hook up of the "additional" GPU would be that it drives all 4 of the MPX DisplayPort lanes. At that point the 4 XDRs of the tech specs would make sense. But even if Apple only minimally hooked up the 'additional" GPU in the Duo it should at least do one more. With two GPU packages hooked up to outputs there is no why it should be same as only one.

My reading of he passage is that they are outlining that the Duo can do 5k on the top/rear also unlike the Solo version of the card which is "maxed out" with just the two XDRs. More than two XDRs probably isn't going to be a common configuration.

I suspect will get increasingly quirky behavior with a Duo loaded down with four XDRs since the connection to the host system is just one x16 PCI-e link. If start loading extremely high bandwidth, uncompressed data to four different 10-bit color screens all funneled through one slot may run into a problem.
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If that is the case, would it be possible to buy a Vega II duo with the machine and then add a Vega II solo in the other MPX module? Would the infinity fabric work in this case with a Duo and a Solo? I can only see info about infinity fabric for two Vega II solos or two Vega II Duos.
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That appears to need a custom Infinity Fabric connector that Apple doesn't' appear to make. ( so they probably don't have driver support for that configuration. ). Technically it should be possible, but decent chance Apple didn't do the work to enable it.