While many notebooks will allow you to install or exchange both memory modules at the same physical location, you will have to access two different spots to upgrade the SO-DIMMs of the Latitude D630. The first DIMM can be found on the bottom of the notebook after removing a little cover. The second DIMM socket is located on the top of the device, below the keyboard and right next to the mouse keys.
The DIMM socket for RAM channel A is located at the bottom of the notebook motherboard, and so is accessed through a little opening. Removing the small metal cover is sufficient to install or exchange a memory module.
The second DIMM socket, for RAM channel B, can be found right next to the touchpad buttons. You’ll have to remove the keyboard to access it.