Get-PCIeLinkSpeeds.ps1

Param
(
    [string]$ComputerName = $env:ComputerName,
    [string]$Class,
    [string]$Manufacturer,
    [string]$Name
)

$pnp = Get-WmiObject -Class "Win32_PNPEntity" -ComputerName $ComputerName

if ($Class)
{
    $pnp = $pnp | Where-Object { $_.Name -match $Class }
}
if ($Manufacturer)
{
    $pnp = $pnp | Where-Object { $_.Name -match $Manufacturer }
}
if ($Name)
{
    $pnp = $pnp | Where-Object { $_.Name -match $Name }
}


$pnp | ForEach-Object {
    try
    {
        $PCIeCurrentSpeed = ($_.GetDeviceProperties('DEVPKEY_PciDevice_CurrentLinkSpeed').deviceProperties[0].Data).ToString()
        $PCIeCurrentWidth = ($_.GetDeviceProperties('DEVPKEY_PciDevice_CurrentLinkWidth').deviceProperties[0].Data).ToString()
        $PCIeMaxSpeed = ($_.GetDeviceProperties('DEVPKEY_PciDevice_MaxLinkSpeed').deviceProperties[0].Data).ToString()
        $PCIeMaxWidth = ($_.GetDeviceProperties('DEVPKEY_PciDevice_MaxLinkWidth').deviceProperties[0].Data).ToString()

        New-Object PSObject -Property @{
            "Name" = $_.Name;
            "Class" = $_.PNPClass;
            "Manufacturer" = $_.Manufacturer;
            "PCIe Link" = "$PCIeCurrentSpeed x$PCIeCurrentWidth";
            "PCIe Max" = "$PCIeMaxSpeed x$PCIeMaxWidth";
        }
    }
    catch {}
} | Sort-Object Class,Name | Select-Object Name,Manufacturer,Class,'PCIe Link','PCIe Max' | Format-Table