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System Memory
Two slots are available for system memory riser cards. The system memory riser cards
are located for easy access in the CEC drawer. (These slots are shown in "System
Board Locations" on page 20.) Each memory riser card has 16 DIMM slots.
Four sizes of DIMMs are available: 128 MB, 256 MB, 512 MB and 1 GB. In addition,
certain 32 MB DIMMS from earlier RS/6000 systems can also be used.
One-Way Processor Memory Placement Rules
The rules for one-way processor memory are as follows:
v Minimum memory is 1 pair of DIMMs in slots 1 and 8 (see "One-Way Processor Card
Memory DIMM Locations" on page 22).
v Maximum memory is 4 DIMM pairs in slots 1 through 8 (see "One-Way Processor
Card Memory DIMM Locations" on page 22).
v Each memory riser slot must have a memory filler card installed.
v When you are installing a memory riser 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 (1 quad).
Riser Card Memory Placement Rules
The rules for riser card memory are as follows:
v Memory quads must contain DIMMs of equal memory size.
v Quad memory size may be mixed on a riser card.
v The minimum memory is four DIMMs. This memory must occupy quad A, which is
slots 1, 2, 15, and 16 (see "Memory Riser Card and Memory DIMM Locations" on
page 21).
v Populate the riser card starting with quad A and continuing with quads B, C, and D
(see "Memory Riser Card and Memory DIMM Locations" on page 21).
26
Service Guide
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