So no more "half the size" of the current Mac Pro dear Mr Mark Gurman?
I kind of always wondered if he or someone he talked was horrible at math and geometry and the "half the size" enclosure was "half the size on each of the three dimensions".
20.8 x 17.7 x 8.58 (inches) =====> 10.4 x 8.85 x 4.29
then remember that the height (first number) includes handles and feet that could go away completely if a literal desktop system. 18.8 --> 9.4 and flip it on its side (with width becomes height ) 4.29 x 9.4 x 8.85
Mac Studio : 3.7 x 7.7 x 7.7 (inches )
That would be in the ballpark of being a 'taller Mac Mini" . But "half the size" is a illustrative example of playing the 'telephone game'.
Another leaker reported that there was a one-slot-wonder M1 "double ultra" Mac Pro prototype so perhaps another enclosure died along with that SoC.
Some folks where trying to chop the dimensions to block full length , full height PCI-e cards which didn't make any sense all along either.
Even if Apple reuses the same case. Not necessarily going to get a whole lot more aggregate bandwidth. That could just be a cost saving measure as much as anything else. They have a subcontractor that can make them and don't have to hire a new one. Just don't fill it up on the inside exactly the same way. ( like the M1 Mini , MBA , MBP 13" ). IF there was a half sized case that spend R&D money on that is going down the drain ... going cheap ( $0.0 R&D would be a likely Apple move to claw the money back. )
So no more M Extreme SoC, no more half the size Mac pro....why people should pick this instead of a future M2 Ultra Mac Studio?!
If Apple had a M2 Ultra that did just x16 PCI-e v4 and an Extreme that did two x16 PCI-e v4. If feed either of those inputs into a 'dual input' PLEX PCI-e switch like they used in the Mac Pro 2019 then could have 6-8 slots either way. One has better backhaul than the other , but the SoC shift wouldn't impact the most of the rest of the motherboard layout.
Even less so if both the Ultra and Extreme both had two x16 PCI-e v4 coming out or both just one x16 .
Extremely doubtful that Apple was going to try to build an "Extreme" only Mac Pro. That makes about zero sense. The price point is already problematically high. Pushing it higher is only going to put the system on a faster pricing death spiral. What the Mac Pro more so needs is walking back from those far out fringe upper 10% percetile BTO configurations.
THe Mac Studio has one , and only one , internal drive. Zero internal PCI-e slots. Even if the Mac Pro matches on SoC (e.g., M2 Ultra) if the Mac Pro has 4slots (at half the size) and can provision 2-4 M.2 x4 PCI-e v4 internal drives then that is a significant "value add" gap between the two systems. Simply just match a GPU doesn't equate two workstations. Some folks have that narrow viewpoint but not everyone does.
Going from 4 slots to 6-8 slots is incrementally better. It isn't a whole lot better if the backhaul behind those 2-4 more slots is
exactly the same as the backhaul behind the 4. Both of them however a load better than the backhaul of just one Thunderbolt 4 port.
It must be something else here
If Apple has decide to sell the MP 2019 even longer into the future than having the same case for both lowers bill-of-material (BOM ) costs for both.
If the Extreme was pulled one path for Apple would be to drop the Vega II Pro , lower the W6x000 prices a bit and limp along. If can get discounts out of Intel drop the CPU prices also (although good luck with that now not a prime volume customer anymore).
[ The W6900 is priced higher than a W6800 Duo. one die priced higher than two of the exact same die. Folks talk about gouging .... that's gouging . That was crypto pricing wars on steroids. That mania imploded a while back now. Perpetuating that pricing in 2023 is almost suicidal. ]