System Memory; Processor Card Dimm Locations; Initial System Memory Configurations - IBM eserver p Series Service Manual

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System Memory

The main memory for the pSeries 650 consists of memory DIMMs plugged into the processor cards. Each

processor card has eight DDR memory DIMM slots for system memory. The memory DIMMs must be

installed in quads. DIMM quads are available in 2 GB (4x512 MB), 4GB (4x1 GB), and 8 GB (4x2 GB)

sizes. The resulting total system memory ranges from 2 GB up to 64 GB.

The following figure indentifies the memory slots located on the processor cards.

For optimum performance, the memory must be installed in the system in a balanced configuration, in that

each processor card that is installed in the system, regardless of type, must have the same amount of

memory installed. In addition, the following basic rules apply:

v DIMMs must be installed in groups of four DIMMs (quads).

v A quad of DIMMs must be all of the same size.

v Quads are populated in DIMM slots 1, 3, 6, and 8 first and then slots 2, 4, 5, and 7.

The following tables show memory configurations that are balanced for optimum system performance.

The values in the following tables describe the memory quads that are installed on each processor card to

make the total system memory balanced. For example, an entry of "4" indicates a single memory quad of

4 GB; four 1-GB DIMMs (one quad) are installed on one processor card. An entry of "4+2" indicates two

memory quads; one of 4 GB plus one of 2 GB, both installed on one processor card. In this case, there is

a total of 6 GB of memory installed on a processor card.

The memory DIMMs represented by the number on the left side of the equation, 4 in the previous

example, should be installed in DIMM slots 1, 3, 6, and 8 of the processor card.

EserverpSeries 650 Service Guide

Two Processor

Three Processor Cards

Four Processor Cards

Eserver p650