IBM RS/6000 7043 260, Service Manual

Page: 48 / 322

General Memory Information
Be sure to unplug the power cable before removing or installing the memory card(s)
or memory modules to avoid damage to them.
Memory cards can be installed in either slot (or both) on the system board, there is
no requirement that one be installed before the other.
It is perfectly acceptable for there to be two partially populated memory cards in the
system, the first memory card does not have to be fully populated before memory on
the second memory card is useable.
Memory modules, on the other hand, must be installed in matched (size and speed)
pairs. Refer to “Memory Modules” on page 7-14 for labeling of the memory card and
instructions on module removal and installation (do not, however, replace the covers
as directed while troubleshooting this problem). A single memory module pair may be
installed in module slots J1 and J2 (not slots J1 and J3). A second memory module
pair could be installed in module slots J5 and J6 (slots J3 and J4 do not have to be
populated first). Along these same lines, there is no requirement that memory
module slots J1 and J2 be populated before another slot pair.
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Service Guide