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.

Basics

The current RAM configuration can be accessed via the Windows key + Pause.

But there is no information about the manufacturer, the speed and the serial number.

Get-WmiObject

To get this information run 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