Memory Loading Rules and Guidelines
Use the following rules and guidelines when installing memory:
• Install DIMMs in pairs for the 8-DIMM memory carrier and quads in the 24 DIMM memory
carrier.
• Ensure that all DIMMs within a pair or quad are identical.
• Install pairs or quads in order of capacity from largest to smallest. For example, install all 2
GB quads before 1 GB or smaller quads, and install all 1 GB quads before 512 MB quads.
• Side 0 must have equal or greater memory capacity than side 1.
• Install DIMM pairs or quads based on the following rules:
Load pairs or quads into the memory carrier in order, starting with slot 0 and ending with
slot 2.
1.
2. Install the first pair or quad in side 0.
3. Install the second pair or quad in side 1.
4. For the remaining pairs or quads:
a. If both sides of the memory carrier contain the same capacity of memory, install the
next pairs or quad in side 0.
b. If side 0 contains more memory capacity, even though it may have less DIMMs than
side 1, install the next pair or quad in side 1.
c. If side 1 is full, install the remaining pairs or quads in side 0.
Table 7 shows several examples of proper memory carrier loading order.
NOTE: The number in parenthesis indicates the order in which the quads are loaded.
Table 7 24-DIMM Memory Carrier Loading Examples
Memory Carrier Side 1Memory Carrier Side 0Quad Slot IDsQuad Number
Example 1
2 GB (2)2 GB (1)0A 0B 0C 0D0
1 GB (4)1 GB (3)1A 1B 1C 1D1
512 MB (6)512 MB (5)2A 2B 2C 2D2
Example 2
1 GB (2)2 GB (1)0A 0B 0C 0D0
1 GB (3)512 MB (4)1A 1B 1C 1D1
512 MB (5)2A 2B 2C 2D2
Example 3
1 GB (2)2 GB (1)0A 0B 0C 0D0
512 MB (3)1A 1B 1C 1D1
512 MB (4)2A 2B 2C 2D2
Example 4
512 MB (2)2 GB (1)0A 0B 0C 0D0
512 MB (3)512 MB (5)1A 1B 1C 1D1
512 MB (4)512 MB (6)2A 2B 2C 2D2
26 Installing the System
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