Speed up comparing multiple sets of data

Right now I am working on a couple scripts that take data from a couple sources and tries to match them up.  I have a working method but am trying to find out if there is a better way to do what I am trying to do.

What I am trying to do is match up a computer name from a CSV file with one from a SCCM SQL query.  Right now the CSV has 8500ish lines while the SCCM query returns 13000ish.  So, I am looping one hell of a lot to find that one PC name in the SCCM query.  Is there a better / faster way to do that compare?  Other than looping through the SCCM query multiple times?

#$SCCMPrimaryuser SQL query
(contains Computername, Primary user, last logged on user, timestamp)
$DPInfo = Import-Csv ".\DataProtector_AccountInfo.csv"

$output=@()
$DPInfo | % {
    $dpIDdisplay = $_."DP ID display"
    $dpID = $_."DP ID"
    $dpDiplayName = $_."DP Displayname"
    $dpComputer = $_."DP Computer Name"
    $dpEmail = $_."DP email"
    $dpLastBackup = $_."DP Date Last Backup"
    $dpStatus = $_."DP Status"

    $sccmllou = $null
    $sccmllouT = $null
    $sccmPrimUser = $null
    $SCCMPrimaryuser | % {
        If ($dpComputer -eq $_.ComputerName){
            If ($_."Last Logged on User"){$sccmllou = $_."Last Logged on User"}else{$sccmllou = "n/a"}
            If ($_."Last Login Time"){$sccmllouT = $_."Last Login Time"}else{$sccmllouT = "n/a"}
            If ($_.PrimaryUser){$sccmPrimUser = $_.PrimaryUser}else{$sccmPrimUser = "n/a"}
        }
    }
 
        $record = @{"Computer" = $dpComputer}
        $record.add("DP Display ID",$dpIDdisplay)
        $record.add("DP ID",$dpID)
        $record.add("DP Email",$dpEmail)
        $record.add("DP Last Backup",$dpLastBackup)
        $record.add("DP DisplayName",$dpDiplayName)
        $record.add("SCCM Primary User",$sccmPrimUser)
        $record.add("DP Status",$dpStatus)
        $record.add("SCCM last log user",$sccmllou)
        $record.add("SCM Last log time",$sccmllouT)

        New-Object PSObject -Property $record | out-null 
        $output+=New-Object PSObject -Property $record | Out-Null   
}