Hi All, so long everybody.
ASi Mac Pro....
Of course I'm still at the anti-Gurman side, but this time happens its really easier to guess the ASi MP 8,1
There are no Technical Challenge for Apple to deliver an ASi Quad M2 Max Mac Pro, IMHO Gurman moved to clickbait business model.
RAM:, Until now all Mac with M1/M2 chips use Soldered Ram, indeed dont need RCDs chips to interface with DDR5 Dimms, if apple just add this component the M2 Max is not restricted to "in die" ram (actually not in Die, as are pcb soldered) as the RCD enable it CXL-PHY jedec-std DDR5 connections, but there is an catch, the Mac Pro likely to be very picky about DDR5 modules, and a minimum 2 channel by each M2 Max on board shall be populated (from 4) thus the Mac Pro likely will require 4 DIMM for M2 Ultra, and 8 DIMM for M2 Extreme all populated with same kind, size, cas, etc dimm modules, and likely upto 16 DIMM could connect, 16x48GB =768GB using consumer gradea DDR5 DIMM, with commercially available (and crazy expensive) 256GB server modules the Mac Pro could be configured with upto 4TB of ram, but likely you'll need to sell your Lambo to pay for it likely north 80K$.
PCIe expansion: the Fabric Interconnect Chip (aka Ultra Fusion) maybe provided for an PHY/PCIe interface which Apple May configure without restrictions, but I believe it will provide only 2 PCIe5 x16 slots and 2 or 3 PCIe4 X16. or 2 PCIe5x8 + 1 PCIe 4x16, PCIe5 slots enabled to install Compute Accelerators including GPUs, M2 Extreme/Ultra fabric "ultrafussion" likely to be a much more elaborated solution than one one M1 Ultras, not just because apple needs to plug PCIe peripherals also it requires bus multiplexing and 4 way traffic arbitration, almost trivial for m1 ultra but quite more complex for M2 extreme but nothing new, And, Nvidia, Intel,Ampere both have developed even 8 ways dilution
Discreet GPU: M1/M2 mac cant connect external GPU using thunderbolt even booting Linux due Apple (I think as safety meausre) restricted Thunderbolt PCIe what is known as DMA or direct memmory access, what enables an peripheral to write data back to system RAM without occuping the CPU, it also saves integration with PHY/Fabric, but nothing Apple Engineers not aware how to enable on STD PCIe devices (if I own an M2 Max MBP i'll try now to test if it recognizes TB3-linked eGPU).
About the Software, Mac OS and Metal never removed support for multiple vendor GPUs as long those GPUs load the respective platform compatible Drivers, so from the respective Driver Update the Mac Pro should be capable to use AMD CDNA2/RDNA2 even CDNA3-RDNA3 GPUs as the monster Instinct MI100 or the productive (and more powerful than M2's GPUs) RX 7900 XTX, maybe even later intel could join to the party with their ARC gpus, since Intel isn't banned at apple neither they ban apple as nVidia, don't expect Apple to enable eGpu, neither legacy MXP modules, while likely the MP8,1 to retain MP7,1 cheese grater chassis, it's MPX modules likely limited to 2x PCIe 5 x16 and 2x PCIe5/4 x8 and an PCIe 4 x16.
My predictions:
Early February/March Apple should Release the M2/M2 Pro iMac 24 along showcase the VR/AR glasses, then at WWDC after M2 Max/Ultra Mac Strudio Introduction should introduce the M2 Ultra/Extremme Mac Pro, sharing the iconic CheeseGrater chassis (even with 400$ wheels), with upto 4TB DDR5 DIM ram (or at least 768gb), 16TB NVME, single/dual AMD GPU optional, starting somwhrere near 6000$ for base M2 Ultra+32gb DDR5 (rx 8GB) DIMMS +1TB and close 12000$ for M2 Extremme Models starting with 64GB DDR5 ECC (8x8gb) DIMMS, none including dGPU, and options based on newest radeon GPUs priced as current ones, old MPX likely modules not compatible with the new Mac Pro as it likely to ditch the x16 PCIe extension it requires, but other MPX modules not requiring the PCIe extension likley compatible from Day 0 as HDD cages, even dont discard an Afterburner successor, based on ASIC instead FPGAs indeed ridiculous powerful but at least 20x the current card, or using half power on an 10x more powerful accelerator.
I've been tiped (this is just speculation, take with tons of sea salt), along the Afterburner or instead, apple may introduce an monster TPU/NPU accelerator card, which will bring the Mac Pro the crown as the most powerful AI training workstation, even this card maybe a good alternative for Radeon GPUs.
All this comes from my own Chrystal Ball special, I'm no one at Apple neither in touch with anyone at Cupertino.