The Mac Pro Killer Build Guide, featuring Supermicro and Intel
Supermicro sent us their C621 chipset X11SPA-T motherboard, which does support the new Xeon W CPUs. You can also take into consideration the number of PCI-E slots you would like, in the case of this motherboard there is a PEX8747 chip that takes x16 lanes and outputs x32, so that we have a total of seven PCI-E slots.