96 iSeries and AS/400e System Builder
Main storage
Base There is no base memory on the 270 models.
Model 270
Main
Memory
Rules
Processors #2248, #2250, #2252, #2253, #2422, #2423, and #2424
All main storage cards must be added in
pairs when attached directly to the Processor or quads when attached to the
#2884 Main Storage Expansion Riser Card. The pair or quad set must be of the same feature code.
Eight slots are available in the base system (except #2253 and #2424) for main storage cards, which plug directly on to the
processor (direct attach) and do not require a Main Storage Expansion Riser Card. Processors #2253 and #2424 have 16
base memory slots using a “base” Main Storage Expansion Riser Card.
For Processors #2252/#2423, when more than eight total cards are required, a #2884 Main Storage Expansion Riser Card
must be ordered as a separate priced feature and
all memory cards must plug into the #2884 card. When #2884 is used,
direct attach of DIMMs to the processor is not allowed.
Processors #2252, 2253, #2423, or #2424 using the #2884 Main Storage Expansion Riser Card must install DIMMs, in
sets of four (quads). A single PAIR of DIMMs is allowed on the initial order if they are the only two on the system. Any
memory DIMMs added beyond the initial pair must be placed in quads, and the initial DIMM pair must completed to a quad.
There are 16 slots available in the system using the #2884 Main Storage Expansion Riser Card for placement of main
storage DIMMs.
Processors #2431, #2432, and #2452
A single main storage DIMM is allowed on these processors. When additional DIMMs are required, a second DIMM of the
same capacity must be added the pair with the existing DIMM. Any additional DIMMs must then be added in pairs of the
same capacity. The DIMM memory features used on these processors are unique to this processor set and do not work
on any other Model 270 processor. Eight slots are available in the base system for main storage DIMMs, which plug directly
into the processor (direct attach).
Processors #2434 and #2454
A minimum of four main storage DIMMs of the same capacity and technology must be selected. This processor includes
a base CCIN 2884 Memory Expansion Card. All main storage DIMM features plug into this card. There are 16 slots
available on this processor and all main storage DIMMs must be added in sets of four (quads). Each DIMM in the set of
four must be of the same capacity and technology. All DIMMs must be plugged in quads starting from the outer four corners
going toward the center (A, B, C, D, then E, F, G, H, and so on). Using the same feature code number within a quad is
required. Mixing quad “groups” on the same riser card is also allowed (including mixing stacked (#3025) and unstacked
(#3024) memory technology).
See the tower diagrams in Chapter 8, “IBM iSeries towers schematics” on page 293, for placement of memory.
#2884 #2884 Main Storage Expansion Riser Card
The #2884 mounts additional main storage cards. It contains 16 slots for placement of 128 MB, 256 MB, 512 MB, or 1 GB
memory cards. For placement, an initial pair of memory cards is allowed (in slot A and slot B) without quads except on the
#2434 and #2454, which must always have memory installed in quads. After that, all cards must be plugged in quads.
Starting from the outer four corners going toward the center (A, B, C, D, then E, F, G, H, and so forth). Using the same
feature code number within a quad is required. See the tower diagrams in Chapter 8, “IBM iSeries towers schematics” on
page 293, for placement of memory.
Mixing quad “groups” on the same riser card is allowed.
Refer to “Model 270 Main Memory Rules” on page 96 for memory restrictions.
Maximum: One on the #2252, #2423 Processor. One as “base” on the #2253, #2424, #2434, or #2454
The #2884 is not supported on the #2248, #2250, #2422, #2431, #2432, or #2452 processor
The #2884 is a Customer Install Feature.
#3022 128 MB Main Storage (DIMM, 64 Mb technology)
Supported on the #2248, #2250, #2252, #2253, #2422, #2423, #2424, #2434, and #2454 processors.
On the #2434, and #2454 processors, the #3022 is supported only; it cannot be ordered new except to meet the pair or
quad system memory requirement. When new 128 MB DIMMs are required, order the #3029.
The #3022 cannot be mixed with #3029 in pairs or quads.
Refer to “Model 270 Main Memory Rules” on page 96 for memory restrictions.
The #3002 is a Customer Install Feature.
The #3022 was withdrawn from marketing on 01 June 2006.
