Replacing A Memory Module - Lenovo ThinkStation C20x 4269 Hardware Manual

Replacing a memory module

This section provides instructions on how to replace a memory module.
Your computer has eight slots for installing or replacing DDR2 DIMMs (double
data rate 2 dual inline memory modules).
When installing or replacing memory modules, use the following guidelines:
v Install the DIMMs in identical pairs, which means the DIMMs of a pair should
v The two DIMMs of a pair must be identical, but one pair can differ from another
v DIMM Slot 1 is closest to the graphic cards, and DIMM Slot 8 is closest to
be the same size, speed, and organization.
Examples:
Correct: 2 GB PC2-5300 2Rx4 + 2 GB PC2-5300 2Rx4
Incorrect: 2 GB PC2-5300 2Rx4 + 2 GB PC2-5300 2Rx8
Incorrect: 2 GB PC2-5300 2Rx4 + 1 GB PC2-5300 2Rx4
Note: If the size, speed, or organization of two DIMMs in one pair is different,
the second DIMM will be invalid.
pair.
the power supply.
Install DIMMs in the following order, as shown in the figure below:
1. Install the first identical pair: DIMM 1 and DIMM 3 .
2. Install the second identical pair: DIMM 5 and DIMM 7 .
3. Install the third identical pair: DIMM 2 and DIMM 4 .
4. Install the fourth identical pair: DIMM 6 and DIMM 8 .
Chapter 10. Replacing FRUs (types 6427 and 6493)
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