Memory Configuration Guidelines C-9
6. Install any remaining modules (2 SIMMs), filling in the lowest-numbered slots on the extender with the
most available slots.
Procedure for Dual Memory Extenders — Detailed
Step 1. You must remove any modules from each memory extender.
If you have only one pair of memory modules in your system, and that pair has been split
across the two memory extenders, you will get a "Memory not optimized" warning when
you boot your system. Remove the module from one extender and add it to the module on
the other extender (see Step 5 below).
Step 2. Combine the removed and new memory modules and organize them into four groups:
• 512MB modules
• 256MB modules
• 128MB and 64MB modules (combined in the same group)
• 32MB modules.
Step 3. From each memory group, create as many pairs of modules (sets of 2 modules, or 4 SIMMs) as
possible. A 128MB and 64MB module can be used as a pair of modules since they are from the
same group. Set aside any remaining modules of each size for installation last.
Remember, each module consists of 2 same-size SIMMs. Any remaining single SIMMs are
"unusable."
Step 4. Locate and identify each available slot by its slot number and letter (e.g., 0a, 0b) on each
memory extender. Identify the sequence of slots from lowest to highest
Step 5. Install any pairs of modules first as follows:
A. Install modules in decreasing size: start with the largest memory size and end with the smallest. Within
a mixed-group of 128MB and 64MB modules, install the 128MB modules first.
B. Install pairs of modules beginning with the lowest available slot number on the extender with the most
slots open.
If both extenders are empty, the first pair of module would go in slots 0a/0b and 1a/1b on the first
extender; the second pair of modules would go in slots 0a/0b and 1a/1b on the second extender; the next
Notes
In the examples that follow, the extenders are labeled "first extender" and "second extender." It is also
useful to refer to these as "Extender 0" and "Extender 1", corresponding to the lower and upper
extender slots in the system memory bay.
Adding A Memory Extender
If you are adding a new memory extender at the same time you are adding memory, you will likely
need to remove and re-sequence all the memory modules from your current memory extender. Review
these optimization procedures for dual memory extenders to understand the need for balancing pairs of
memory modules across the two extenders.
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