Supermicro X11SRM-VF Motherboard mATX for single Intel Xeon Processor W family, Socket R4 LGA 2066, up to 128GB ECC RDIMM or 256GB ECC LRDIMM | Wiredzone
Amazon.com: Asus WS X299 SAGE/10G Workstation Motherboard - Intel Chipset - Socket R4 LGA-2066 - SSI CEB - 1 x Processor Support - 128 GB DDR4 SDRAM Maximum RAM - 4.20 GHz
Amazon.com: ASRock Rack WC422D8A-2T/U Single Socket R4 LGA2066/ Intel C422/ DDR4/ SATA3&USB 3.1/ V&A&2GbE/ ATX Server Motherboard : Electronics