Free Standby Memory without a Reboot

Run ProcessHacker as admin, click on View->System Information->Memory->Memory Lists->More and select here Empty Standby List under the entry empty:

You can use RAMMap v1.5 (https://technet.microsoft.com/en-us/sysinternals/ff700229)

1. Download RamMap from Microsoft Windows Sysinternals.
2. Run RamMap (installation is not required).
3. Wait until UseCounts shows the memory map.
4. On the Menu Strip, indentify the Empty menu item. Click on it and choose Empty
5. Standby List from the dropdown menu. Press F5 to update the Use Counts tab or check the memory tab on the Windows Resource Monitor to check that the Standby Memory has been released.

Source: https://support.software.dell.com/appassure/kb/118393