Amazon.com: SHANGZHAOYUAN X99 Dual CPU Motherboard LGA 2011-3 Server Motherboard for Intel i7 5th/6th Gen Xeon E5 V3/V4 Series (E-ATX, 8*DDR4 ECC Max 256G, 2*NVME M.2, 2*Gb LAN, SATA 6Gb/s, PCIe 3.0) :
Intel Xeon E5 2680V4 cpu ED4 LGA2011-3 motherboard set 2x16GB DDR4 REGECC memory cpu combo kit PCI-16 USB3.0 Server M-ATX - AliExpress
ASUS and ASRock Prep Gaming Motherboards for Intel Xeon E3 v5 Processors
LGA 1356 MACHINIST X79 Motherboard CPU Intel Xeon E5 DDR3 USB ECC RAM M.2 NVME | eBay
Amazon.com: ASUS WS C621E Sage Extreme Power Intel® Xeon® Processor Workstation Motherboard for Two-way XEON CPU performance, with U.2, M.2 connectors, dual Gb LAN, USB 3.1 Type-C & Type-A, 10 x SATA
AS Rock EP2C612 WS Motherboard + Dual Xeon E5-2630 V3 CPUs + 32 GB of RAM | eBay