What types of CPUs are compatible with this motherboard?

This motherboard supports 2nd Gen Intel Xeon Scalable Processors and Intel Xeon Scalable Processors using a Dual LGA 3647 socket.

What is the maximum memory supported by the Supermicro MotherBoard MBD-X11DPI-N-B?

The Supermicro MotherBoard MBD-X11DPI-N-B supports up to 2TB of 3DS ECC RDIMM and DDR4-2666 MHz memory in 16 DIMM slots.

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Supermicro MotherBoard MBD-X11DPI-N-B Xeon Dual Socket LGA 3647 C621 Max.2TB PCI Express E-ATX (MBD-X11DPI-N-B) Bulk packaging - - OEM

2nd Gen Intel® Xeon® Scalable Processors and Intel® Xeon® Scalable Processors
Dual Socket LGA-3647 (Socket P) supported, CPU TDP support Up to 205W TDP, 2 UPI up to 10.4 GT/s
Intel® C621
Up to 4TB 3DS ECC RDIMM, DDR4-2933MHz; Up to 4TB 3DS ECC LRDIMM, DDR4-2933MHz
Up to 2TB Intel® Optane™ DC Persistent Memory in memory mode (Cascade Lake only);
4 PCI-E 3.0 x16,
2 PCI-E 3.0 x8,
2 PCI-E 3.0 NVMe x4 Internal Port(s)
M.2 Interface: PCI-E 3.0 x4
M.2 Form Factor: 2260, 2280, 22110
M.2 Key: M-Key
Intel® C621 controller for 14 SATA3 (6 Gbps) ports; RAID 0,1,5,10
Dual LAN with 1GbE LAN with Intel® X722
1 VGA port