Source QM9H with Intel Coffee Lake i7-8559U quad core CPU 64GB RAM multi serial port MINI-ITX motherboard with Intel Iris Plus Graphics on m.alibaba.com
Supermicro CSE-819U X10DRU-i 1U Server 2x E5-2650V3 64GB Ram 4x 3 5" HDD Bay
Yes, you can put 64GB RAM in the DS3622xs+ : r/synology
Motherboard M-ATX B760M DDR4 64GB RAM Core i9 CPU 12 13 Gen Gaming Pcie 4.0 PC | eBay
Elsky Qm11u with Tiger Lake 11th Gen Core I7-1165gre CPU 4 Monitors Edp DC12V/19V 2xddr4 Max to 64GB RAM 1tb SSD Motherboard - China Mini Itx Motherboard and Tiger Lake CPU price | Made-in-China.com