HP Compaq dc7100 DT Hardware Reference Manual page 28

Hardware Upgrades
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If only one memory module is used in the system, it must be installed
in the same socket that held the preinstalled memory module.
8. To install a memory module:
a. Press out on both latches 1 of the DIMM socket.
b. Match the notch on the module with the tab on the memory
socket. Firmly push the module straight into the socket 2,
ensuring that the module is fully inserted and properly seated.
The latches will close automatically when the module is
seated correctly, securing the module in the slot 3.
Adding Memory Modules
A memory module can be installed in only one way. Match the notch
on the module with the tab on the memory socket.
For maximum performance, populate the sockets so that the memory
capacity of Channel A is equal to the total memory capacity of
Channel B. For example, if you have one preinstalled DIMM in
socket XMM1 (Channel A) and are adding a second DIMM, it is
recommended the second DIMM be of equal memory capacity.
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