Apple Xserve Intel (Late 2006) DIY Procedure for Logic Board - Manual (Page 22)

Xserve (Late 2006) Logic Board Replacement Instructions 
Tighten the five Phillips screws that fasten the airflow duct to the fan array, in the order
shown, to prevent the duct from warping. Do not overtighten the screws.
Replacing the FB-DIMMs
Important: Be sure to install each FB-DIMM in the slot on the replacement board that is
equivalent to the slot you removed it from on the original logic board.
Align the first FB-DIMM with its slot and press down until the latches snap back up into
place.
Note: The FB-DIMM is designed to fit into the slot only one way. Be sure to align the notch in
the FB-DIMM with the small rib inside the slot.
Repeat for the remaining FB-DIMMs.
Connectors Notch Ejectors
3.
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