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You can check the amount of installed RAM in the BIOS setup menu. You can use same memory type for a Latitude D820 too. One slot (DIMM B) can be easily accessed on the bottom of the laptop. Before you start, please turn off the computer, unplug the AC power adapter and remove the battery. Lift up one side of the keyboard cover with a small flat head screwdriver. 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.