WMI query spilling over to host output instead of variable after 200 results - PSv3

$tmp = get-adcomputer -filter "BLAH that gives me 480 machines"
$tmp = $tmp | select Name

$cs = Get-WmiObject win32_computersystem -ComputerName $tmp.Name

After machine 200 Powershell starts spewing objects to the ISE host instead of putting them in $cs. Any list under 200 machines and it works perfectly.

Anyone know what is going on in this case?

info: PSv3, running Windows 7, AD Domain environment

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I get a blinking cursor for a long while (as it should be), interupted by the occational "gwmi: The RPC server is unavailable." Error. And then line after line of this...

::Sample output::

SystemDirectory : C:\windows\system32
Organization    : BLANKED
BuildNumber     : 7601
RegisteredUser  : BLANKED
SerialNumber    : BLANKED
Version         : 6.1.7601

SystemDirectory : C:\WINDOWS\system32
Organization    : BLANKED
BuildNumber     : 2600
RegisteredUser  : BLANKED
SerialNumber    : BLANKED
Version         : 5.1.2600

SystemDirectory : C:\WINDOWS\system32
Organization    : BLANKED
BuildNumber     : 2600
RegisteredUser  : BLANKED
SerialNumber    : BLANKED
Version         : 5.1.2600

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FYI, this is not the only thing going on in the script. the next line pulls the win32_OperatingSystem class and it does exactly the same thing. It grabs the first 200 fine then starts pumping objects to the host.