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System Memory Options
Two slots are available for memory riser cards. Each riser card had 16 sockets. See
"System Board" on page 15, which illustrates the positions of the memory riser cards in
the system.
Four sizes of DIMMs are available: 128 MB, 256 MB, 512 MB, and 1 GB. Certain 32
MB DIMMs from older RS/6000 systems can also be used when upgrading system
memory.
Each of the empty memory riser card slots must have a memory filler card installed.
To upgrade your system memory, you can:
v Install additional DIMMs
v Install an additional populated memory riser card
v Replace existing DIMMs with DIMMs of a larger size
Memory Placement with a One-Way Processor Card
Systems that contain a processor card that has a single processor, also known as a
one-way processor card , can have memory DIMMs installed on the processor card, or
on a memory riser card if available.
v The minimum memory is one pair of DIMMs in slots 1 and 8. This is labeled pair A in
the following figure:
v The maximum memory is four DIMM pairs in slots 1 through 8. These are pairs A, B,
C, and D. DIMM pairs must be installed in order, beginning with pair A and then
progressing to B, C, and D.
v To increase memory on a one-way processor card, add more DIMM pairs or replace
the DIMM pairs with pairs of a larger size.
v If a memory riser card is installed in the system with a one-way processor card:
– Memory DIMMs must be moved from the one-way processor card to the memory
riser card.
– The memory riser card must then have a minimum of four DIMMs. (See "Memory
Placement for a Memory Riser Card" on page 346.)
(8) A
(7) B
(6) C
(5) D
(4) D
(3) C
(2) B
(1) A
Chapter 9. Removal and Replacement Procedures
345
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