If the memory is to be upgraded, then you have to find out whether the new memory is compatible. Therefore you have to find out the type of your currently installed memory. The device manager does not provide any information about this.
Get-WmiObject
Get-WmiObject win32_physicalmemory | Format-Table Manufacturer,Banklabel,Configuredclockspeed,Devicelocator,Capacity,Serialnumber -autosize
Get-CimInstance
You can also run Get-CimInstance.
Get-CimInstance win32_physicalmemory | Format-Table Manufacturer,Banklabel,Configuredclockspeed,Devicelocator,Capacity,Serialnumber -autosize
The Motherboard
To find out whether your motherboard is compatible with the new memory run
Get-WmiObject Win32_BaseBoard