Dell Latitude D630 - Manual (Page 160)

160 Adding and Replacing Parts
To add or replace a memory module in the DIMM B connector:
NOTICE: If you need to install memory modules in two connectors, install a
memory module in the connector labeled “DIMMA” before you install a module in
the connector labeled “DIMMB.” Insert memory modules at a 45-degree angle to
avoid damaging the connector.
1 Follow the procedures in "Before You Begin" on page 149.
2 Turn the computer bottom-side up, loosen the captive screw in the
memory module cover, and then remove the cover.