query network speed on all devices in specific OU

Need to query adapter speeds for all devices in specific OU

following works for my device but need to report on all devices in (OU=XP,OU=Workstations,OU=Devices,DC=prod,DC=prv)

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PS C:\Users\Admin.Remi.Boileau.PROD> Get-WmiObject win32_networkadapter -Filter 'index = 11'

ServiceName      : e1qexpress
MACAddress       : C8:60:00:8B:6F:C4
AdapterType      : Ethernet 802.3
DeviceID         : 11
Name             : Intel(R) 82574L Gigabit Network Connection #2
NetworkAddresses :
Speed            : 100000000

This also works but again, only outputs my adapter settings

PS C:\Users\Admin.Remi.Boileau.PROD> Get-WmiObject -class Win32_PerfRawData_Tcpip_NetworkInterface -ComputerName Localhost | Format-Table Name,@{label="LinkSpeed(MB)";Expression={$_.CurrentBandwidth/1000000 -as [int]}}