I would expect not. First because there already are x8 slots there already. The upcoming Mac Pro basically overprovisions the CPU PCI-e lanes out of the box.I wonder if the MP 7,1 will support bifurcation on the x16 slots? That would allows using the cheaper m.2 adapters that don't have those hot PCIe switches. Anyone have insight?
+1 on this. A quick search on intel's ark didn't bring up the chipset DMI lane support on 2nd Gen Xeon-W, but hopefully it's x16 lanes rather than the usual x4 PCI 3.0 lanes to the chipset. If it's only x4 from CPU to PCH then that may explain the slower T2 SSD speeds from sharing (switching) lanes between 10Gbe, T2, TB3, internal SATA ports, and all the other items you listed.the PCH is even more clogged up. x4 T2 , x2-4 10GbE , x2-4 !0GbE , x4 Thunderbolt top , x1 Wi-fi , x1 Bluetooth. [ So that's probably why slot 8 or the 1a/3a/ or 6-7 not allocated off the PCH. ]
No previous Mac Pro has ( including the Mac Pro 2013). Why would Apple start now with even more slots to timeshare bandwidth for and even faster default boot SSD coupled to the PCH? The 2009-2012 model did use a PCI-e switch to share x4 of bandwidth between the two x4 slots. It is far more likely that Apple will do the same thing here. At least for the standard PCI-e slots.So you don’t think any slots are using lanes from the chipset/PCH?
Highly likely not. Lanes reserved for hooking up the C600 series PCH were already in the x48 the first generation had. They got the "extra" x16 to expose as general purpose lanes for the new W 3000 series, 'bigger' socket products+1 on this. A quick search on intel's ark didn't bring up the chipset DMI lane support on 2nd Gen Xeon-W, but hopefully it's x16 lanes rather than the usual x4 PCI 3.0 lanes to the chipset.
Slower SSD speed could also be better wear managements, but yes also in the context of being a being better sharing playmate with others hanging off the fixed PCH DMI bandwidth.If it's only x4 from CPU to PCH then that may explain the slower T2 SSD speeds from sharing (switching) lanes between 10Gbe, T2, TB3, internal SATA ports, and all the other items you listed.
Apple is more likely to shoot for cheaper costs for Apple than cheaper costs for 3rd parties. Even with m.2 x8 cards with a switch Apple SSD prices are still even higher once get to upper half range of capacities. It isn't like they would be trying to keep the cheap m.2 cards out so they could under price the PCI-e switch, M.2 cards. Apple's SSDs are priced over both anyway. The notion of "saving max money" with the bifurcation card just flies the base context of "minimum" price of the Mac Pro being $6K. If saving money was a top 3 objective that wouldn't be the entry price.For maximum bandwidth it'd be far cheaper to load m.2 NVMe's on a x16 riser card (Highpoint 7101/7102, Sonnet 4x4, or the like) than opt for larger CTO flash storage. If bifurcation is supported then hopefully cheaper riser cards without the PLX will work.