IBM 9080-M9S Manual page 630

Figure 546. Replacing the processor voltage regulator modules
11. Replace the memory modules in locations P1-C22 through P1-C53
Tip: Replace the memory modules in the system in the same order in which you placed them in the
tray.
a) Grasp the memory module along its edges and align it with the slot.
Attention: Memory modules are keyed to prevent a memory module from being installed
incorrectly. Note the location of the key tab within the memory module connector before
you attempt to install the memory module.
b) Replace the memory module by pushing it into slot until the tabs (A) lock into place as shown in
the following figure.
c) Repeat steps "11.a" on page 624 through "11.b" on page 624 to replace the remaining memory
modules.
624 Power Systems: Removing and replacing parts in the 9080-M9S system