Install model 51x or 710 memory modules

You might need to install memory modules in the server. Use the procedure in this section to perform this task.

1. Perform the prerequisite tasks described in Before you begin.
2. Stop the system. For instructions, see Stop the system or logical partition.
3. Disconnect the power source from the system by unplugging the system.
   Note: This system may be equipped with a second power supply. Before continuing with this procedure, ensure that the power source to the system has been completely disconnected.
4. Remove the front cover, see Remove the front cover from the model 51x or 710.
5. Place the system unit in the service position. For instructions, see Place the model 51x or 710 in the service position.
6. Remove the service access cover, see Remove the service access cover from the model 285, 51x, 52x, 55x, 710, or OpenPower 720.
7. Determine the slots that the memory modules will be placed in. Memory modules can be plugged in pairs or quads.
   Tips:

   • To balance memory modules a model with the slot location codes C4 through C11, see Table 1.
   • To balance memory modules a model with the slot location codes C5 through C12, see Table 2.
   Figure 1. Example of memory module slot locations

   

   Table 1. Model 51x or 710 memory module balancing

   Memory	Location	Priority
   Two memory modules
   	C11 and C4	1
   	C9 and C6	2
   	C10 and C5	3
   	C8 and C7	4
   Four memory modules
   	C11, C4, C9, and C6	1
   	C10, C5, C8, and C7	2
   Six memory modules
   	C11, C4, C9, C6, C10, and C5	1
   	C11, C4, C9, C6, C8 and C7	2

   Table 2. Model 9110-51A memory module balancing

   Memory	Location	Priority
   Two memory modules
   	C12 and C5	1
   	C10 and C7	2
   	C11 and C6	3
   	C9 and C8	4
   Four memory modules
   	C12, C5, C10, and C7	1
   	C11, C6, C9, and C8	2
   Six memory modules
   	C12, C5, C10, C7, C11, and C6	1
   	C12, C5, C10, C7, C9 and C8	2

8. If necessary, remove the memory module from its antistatic package.
9. Ensure the connector is ready to receive the memory module by removing the memory module filler, if one is present, by pushing the locking tabs A out and then down. The lever action of the tabs forces the memory module filler out of the connector.
   Figure 2. Removing a memory module filler

   
10. Ensure that the connector locking tabs are pushed out in the unlocked position before installing a new memory module.
    Attention: Memory modules are keyed to prevent a module from being installed incorrectly. Note the locations of the key tabs within the memory module connector before attempting to install the memory module.
11. Carefully grasp the memory module along two edges and align the connector.
12. Insert the memory module firmly into the connector.
13. Secure the memory module with the locking tabs A located at each end of the memory module connector, as shown in the following figure.
    Figure 3. Installing a memory module

    
14. Replace the PCI adapter enclosure. For instructions, see Replace the PCI adapter enclosure.
15. Replace the service access cover. For instructions, see Install the service access cover on the model 285, 51x, 52x, 55x, 710, or OpenPower 720.
16. If you are servicing a rack-mounted system unit, see Place the model 51x or 710 in the operating position.
17. Reconnect all power and signal cables to their respective connectors.
18. Replace the front cover. For instructions, see Install the front cover on the model 51x or 710.
19. Start the system. For instructions, see Start the system or logical partition.
20. Verify the installed part. For instructions, Verify the installed part.