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Zhi

macrumors newbie
Original poster
Dec 11, 2020
20
32
China
I drew an architecture diagram based on the Mac Pro 2019 White Paper.

Radeon Pro W6800X Duo MPX Module architecture.png
 

Attachments

  • W6800X Duo 架构.pdf
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joevt

macrumors 604
Jun 21, 2012
6,971
4,262
It looks like one W6800X Duo should be able to connect 9 displays but the white paper says only 8?
It looks like two W6800X Duos should be able to connect 14 displays.

This document https://support.apple.com/en-ca/101868 implies there's a MUX that switches one of the ports of Thunderbolt Bus 0 with the HDMI port. This is not shown in the white paper except for other MPX modules like the W5700X, W6800X, and W6900X. It would explain the 8 display limit though. Then two W6800X Duos would be limited to 12 displays.
 

mattspace

macrumors 68040
Jun 5, 2013
3,344
2,976
Australia
Then two W6800X Duos would be limited to 12 displays.

Theoretically there's 6x4k on a single w6800x, so while you'd expect a single w6800x-duo could do 12x4k on its own, it would be unsurprising if it was set up like the 2013, where only one of the two GPUs actually has display duty.
 
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