Additional DDR slot purpose

[petr.siska]

Hello, I bought PC scrap box and there was mobo KFN4-D16. I noticed additional DDR slot which says "DDR STD 1.8V. I've never seen this and would like to know purpose of it, because mobo has standard DDR2 slots.

 

[camieabz]

Pretty sure it's for this:

https://www.asus.com/Commercial-Servers-Workstations/ASMB3SOL_PLUS_V3/overview/

See also:

https://www.asus.com/Commercial-Servers-Workstations/KFN4D16SAS/specifications/

Additional Slot 1: 1 * SODIMM socket for optional management card