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CAUTION:
The memory module might be very hot. Turn off the computer and wait three to ve
minutes to let the computer cool before opening the computer cover.
This section provides instructions on how to replace a memory module.
Your computer has 6 slots for installing or replacing DDR3 UDIMMs (double data rate 3 error correction code
unbuffered dual inline memory modules).
When installing or replacing memory modules, use the following guidelines:
• Always install DIMMs in the numerical order printed on the system board (DIMM1, DIMM2, DIMM3,
and so on).
• Install memory modules into the blue memory slots rst. Install memory modules into the black memory
slots only after all the blue memory slots are occupied.
• Be sure to install memory modules starting with the memory slots adjacent to the CPU.
To remove or replace the memory module, do the following:
1. Remove the computer cover. See “Removing the cover” on page 78.
2. Locate the memory module slots. See “Locating parts on the system board ” on page 81.
3. Remove the memory module being replaced by opening the retaining clips.
4. Position the replacement memory module over the memory slot. Make sure the notch 1 on the memory
module aligns correctly with the slot key 2 on the system board. Push the memory module straight down
into the slot until the retaining clips close. See “Installing or replacing a memory module” on page 116.
Chapter 10. Replacing FRUs (Type 4105, 4157, 4217) 85