decrease RAM on vsphere 5.5 clients using powershell

hello

I have vsphere clients with 4gb ram deployed and wish to reduce this amount to 1 gb, they are running w8.1

can I do this using the powershell cli software and script?

I can do this one by one by powering down each and then decreasing RAM within the vsphere interface and then powering back on but I need a better and faster way

and if one can do this by using powershell is there a readymade script I can use or edit?

thanks