Memory Subsystem; Memory Placement Rules - IBM IntelliStation POWER 285 Technical Overview And Introduction

2.3 Memory subsystem

The IntelliStation POWER 285 system offers pluggable DIMMs for memory. The system
board provides eight slots for up to eight pluggable DIMMs. The minimum memory for a
1-core processor system is 1 GB and 32 GB as the maximum installable memory option.
Figure 2-4 shows the offerings and memory slots available.

2.3.1 Memory placement rules

In 1.4.2, "Memory features" on page 5, we list the memory features available at the time of
writing for the IntelliStation POWER 285 system.
Memory must be installed in pairs, as required by the feature codes. Memory feature
numbers can be mixed within a system, but not within a pair.
Memory is installed in the following order:
The first pair is installed in J0A and J2A.
The second pair is installed in J0C and J2C.
The third pair is installed in J0B and J2B
The fourth pair is installed in J0D and J2D.
Ordering a memory feature twice, the quad placement rule is preferred, that is for the first
quad, J0A, J2A, J0C, and J2C, and for the second quad, J0B, J2B, J0D, and J2D. The
service information label, located on the top cover of the system, provides the memory
DIMMs slot location information. Figure 2-4 illustrates the memory placement rules.
Note: A pair must consist of a single feature that is made of identical DIMMs. Mixed DIMM
capacities in a pair will result in reduced RAS.
Figure 2-4 Memory placement rules for the IntelliStation POWER 285 system
SMI II
Port A
Port B
SMI II
Port A
Port B
Chapter 2. Architecture and technical overview
J0A
J0B
J0C
J0D
PROCESSOR
MODULE
J2D
J2C
J2B
J2A
13