Dell Inspiron 640M - Manual (Page 115)

Adding and Replacing Parts
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5 Pull the drive straight out of the module bay.
6 Push the new drive straight into the module bay until it clicks.
7 Replace the security device screw.
8 Turn the computer right-side up and open the display.
9 The operating system automatically recognizes the drive. If necessary, enter your password to unlock
your computer.
Memory
You can increase your computer memory by installing memory modules on the system board. See
"Specifications" on page 157 for information on the memory supported by your computer. Install only
memory modules that are intended for your computer.
NOTE:
This computer supports both 533MHz and 667MHz memory modules. If installing another memory module,
you need to ensure both DIMMs have a speed of 667MHz. If one is 533MHz and the other is 667MHz, the computer
will only run at the lower speed of 533MHz and not the maximum memory speed of 667MHz.
NOTE:
Memory modules purchased from Dell are covered under your computer warranty.
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions in the Product
Information Guide.