• If the memory riser cards for the processors have different capacities, populate the largest memory
riser card with system processor CP0.
• Consider the following requirements when you add memory riser cards:
– After all of the first memory riser cards for the system processors are filled up, add a second memory
riser card to system processor CP0. The second memory riser card of each system processor can
have different memory module capacities from the memory module capacity of the first memory riser
card. It is recommended that the memory modules of the second memory riser card have the same
type and size as the first memory riser card.
– Add a second memory riser card to system processor CP1, then to system processor CP2, and finally
to system processor CP3.
Procedure
1. Identify the part and the system that you are working on. For instructions, see Identifying a
part (www.ibm.com/support/knowledgecenter/POWER9/p9haj/sal.htm).
Use the blue identify LED on the enclosure to locate the system. Ensure that the serial number of the
system matches the serial number to be serviced.
2. Stop the system. For instructions, see Stopping a system (www.ibm.com/support/knowledgecenter/
POWER9/p9haj/crustopsys.htm).
3. Label and disconnect all external cables that are attached to the PCIe adapters.
4. Label and disconnect the power source from the system by unplugging the power cords from the
system.
Notes:
• This system might be equipped with two or more power supplies. If the removing and replacing
procedures require the system power to be turned off, ensure that all power sources to the system
are disconnected.
• The power cord (B) is fastened to the system with a hook-and-loop fastener (A). If you are placing
the system in a service position after you disconnect the power cords, ensure that you unstrap the
fastener.
2 Power Systems: Power Systems: Memory
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