Don’t expect a new GPU for the Mac Pro anytime soon. Apple needs to create a custom board for the chip because of its choice to use the MPX connector.
The existing design of the MPX bay can accommodate standard GPU add-in cards without any issues, and it offers two 8-pin molex connections, providing sufficient power up to 300W. This means there’s little need for Apple to develop bespoke hardware for graphics driver software.
A down-clocked AMD 6800 could function well in a revamped iMac Pro, especially with upgraded Thunderbolt v3 controllers that would seamlessly integrate with XDR monitors. There are no significant technical barriers to overcome here, as the baseline W5700X design is only slightly different.
While the GPU packages vary in size, the power delivery and conditioning systems share many similarities. With both options featuring 16GB of VRAM and a 256-bit bus, the layout changes are minimal.
The MPX module associated with the MPX connector wouldn’t require major alterations if Apple retains the same Thunderbolt controllers. The PCI-e, USB feeds, and DisplayPort v1.4 outflow remain unchanged, which means that any design work here would be minimal.
The more significant challenge lies in developing the software drivers, which can be tested using a reference card. Apple’s main concerns aren’t solely technical.
Their motivation may vary, particularly if the new chip is intended for other Mac models. Pricing is another factor; AMD could easily sell its inventory without offering discounts, making it difficult for Apple to negotiate a lower price.
Additionally, Apple may struggle to get adequate supply, as the 6900 is likely a premium binned chip and probably won’t be cost-effective for an MPX module. On a personal note, I plan to purchase a 6800 for my PC this Black Friday, if they are available.
AMD’s supply may remain better than Nvidia’s, but significant excess inventory is unlikely. AMD is already implementing restrictions to manage supply effectively.
The launch of the 6900 appears to be aimed at alleviating shortages, yet demand will likely remain high.
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