Lenovo 6491 - Manual (Page 49)

Installing memory
Your computer has two connectors for installing double date rate 2 dual inline
memory modules (DDR2 DIMMs) that provide up to a maximum of 4.0 GB of
system memory.
When installing memory modules, the following rules apply:
v Use 1.8 V, 240-pin, double data rate 2 synchronous dynamic random access
memory (DDR2 SDRAM).
v Use 256 MB, 512 MB, 1 GB, or 2 GB memory modules in any combination up to
a maximum of 4.0 GB.
Note: Only DDR2 SDRAM DIMMs can be used.
To install a memory module:
1. Remove the computer cover. See “Removing the cover” on page 22.
2. You might have to remove the drive bay assembly to access the memory
connectors. See “Accessing system board components” on page 24.
3. Remove any parts that might prevent access to the memory connectors.
4. Locate the memory connectors. See “Identifying parts on the system board” on
page 25.
5. Open the retaining clips.
6. Position the memory module over the memory connector. Make sure that the
notch 1 on the memory module aligns correctly with the connector key 2 on
the system board. Push the memory module straight down into the connector
until the retaining clips close.
Chapter 3. Installing options 29