Apple Workgroup Server 8150/110 - Manual (Page 45)

6 Touch the metal part of the power supply case inside the server to discharge
static electricity.
Always do this before you touch any parts or install components inside the server.
7 If you are installing a PDS card, remove the termination card from the PDS slot.
Remember that the processor-direct slot must always be occupied by either the
PDS termination card or a functional PDS expansion card. Be sure to keep the
termination card in a safe place so that you can replace it if you remove the
PDS expansion card.
Power supply
Installing an expansion card 29