X99 Dual-Socket Motherboard LGA2011-3 Dual CPU Support RECC DDR4 Memory Computer Motherboard+2XDDR4 4GB 2666Mhz RAM - Walmart.com
Amazon.com: Desktop Motherboard, LGA 2011-3 Dual Socket Desktop Mainboard for Intel x99 Chipset, Support 8 DDR4 DIMM(Single Memory 16G), 6 SATA3.0 Port and 2 NVME M.2 Port : Electronics
A99386-112 Intel XEON Dual CPU Motherboard with Memory Cooler (Refurbished)
Building a Dual-CPU Behemoth from Used Server Parts, ft. CaseLabs & Old Xeons - YouTube
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) :
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) :
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