IBM P5 570 manual Memory subsystem, Memory placement rules, Memory restriction

2.3 Memory subsystem

The p5-570 memory controller is internal to the POWER5 chip. It interfaces to either two (DDR1) or four (DDR2) SMI-II buffer chips and 8 pluggable DIMMs per processor card, as described in 2.2, “Processor cards” on page 23. The minimum memory for a p5-570 processor-based system is 2 GB. The maximum installable memory is 512 GB (using DDR1 memory DIMM technology). The p5-570 total memory depends on the number of available processor cards. Figure 2-7shows memory slot availability.

2.3.1 Memory placement rules

The memory features that are available for the p5-570 at the time of writing are listed in 1.3.2, “Memory features” on page 6. Each memory feature consists of four DIMMs, or quad, and must be installed according to Figure 2-7.The first quad slots are J0A, J1A, J0C, and J1C. For the second quad, the slots are J0B, J1B, J0D, and J1D.

Note: A quad must consist of a single feature (that is, made of four identical DIMMs). Mixing DIMM capacities in a quad is not supported.

First quad Second quad

DCM

2-way

Heat Sink

J1A

J1B

J1C

J1D

SMI II SMI II

J0D

J0C

J0B

J0A

Figure 2-7 Memory placement for the p5-570, DDR1 card

2.3.2 Memory restriction

The p5-570 does not support OEM memory, and there is no exception to this rule. OEM memory is not certified for use in pSeries and in the IBM Sserver p5 systems. If the p5-570

is populated with OEM memory, you could experience unexpected and unpredictable behavior.

All IBM memory is identified by an IBM logo and a white label printed with a barcode on top and an alphanumeric string on the bottom, created according to the rule reported in Figure 2-8.

26p5-570 Technical Overview and Introduction