HP d325 ST Hardware Reference Manual page 26

Hardware Upgrades
Installing a DDR-SDRAM DIMM
If only one memory module is used in the system, it must be installed in the same
socket that held the preinstalled memory module.
If you are adding a second DIMM or replacing a single smaller DIMM with two
larger DIMMs, both DIMMs should be of the same capacity in order to achieve a
higher performing, dual-channel mode.
1. Open both latches of the memory module socket
module into the socket
Installing a DIMM
A memory module can be installed in only one way. Match the notch on the module
with the tab on the memory socket.
2. Push the module down into the socket, ensuring that the module is fully inserted
and properly seated. Make sure the latches are in the closed position
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, then insert the memory
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