How to get NIC speed using PowerCLI

Get NIC speed using PowerCLI script

Connect-VIServer vcenterservername

$VMhosts = Get-VMHost | Get-View
Foreach ($vmhost in $vmhosts){
   Write-Output $vmhost.Name
   $pnic = 0
   Do {    
      $Speed = $VMhost.Config.Network.Pnic[$pnic].LinkSpeed.SpeedMb    
      Write "Pnic$pnic $Speed"   
      $pnic ++
   } Until ($pnic -eq ($VMhost.Config.Network.Pnic.Length))}