The B850M AORUS Elite WIFI6E ICE only supports DDR5 RAM. There is no specific mention of U-DIMM memory modules, which are normally used for servers or workstations. The manufacturer states that the board supports 4 x DDR5 DIMMs, which indicates standard U-DIMMs for desktop systems, but not specifically U-DIMMs for server applications.

I was able to do some research and according to the manufacturer's data, this is another variant of the B850 chipset. As a rule, mainboards with a B850M chipset have fewer PCIe connections, PCIe 4.0 instead of 5.0 and fewer USB ports. However, there are exceptions such as this motherboard with PCIe 5.0 support. You can therefore choose one of the two, depending on the motherboard.