Dell Latitude D830 Replacement Manual page 6

How to replace or upgrade memory in Dell Latitude D830 notebook >> Inside my laptop
The slot DIMM A is empty and you can install a new RAM module in there.
In this notebook memory can run in dual-channel mode which doubles the amount of available memory bandwidth and improves the
notebook performance.
In order to run your notebook dual-channel mode you must have two identical memory modules in slots A and B.
For example, if you have a 1GB module installed into the slot A, you have to install an identical 1GB module into the slot B. In this case
the total amount of memory installed into the notebook will be 2GB and will run in dual-channel mode.
Here's another example. You have a 1GB module in the slot A and install a 2GB module into the slot B. In this case the total amount of
memory installed into the notebook will be 3GB but it will run in regular mode, not dual-channel mode.
http://www.insidemylaptop.com/replace-upgrade-memory-ram-in-dell-latitude-d830-notebook/
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4/6/2011