Your computer has two user-accessible SODIMM sockets, referred to as DIMM A and DIMM B, both accessed from the bottom of the computer. The socket closest to the system board, DIMM A, always contains a memory module. The DIMM B socket may contain an additional module for improved system memory performance.

If the module in the DIMM A socket must be replaced and DIMM B is installed, you must remove DIMM B first.

If your computer has only one memory module, install the memory module in the socket labeled "DIMM A."

If you remove your original memory modules from the computer during a memory upgrade, keep them separate from any new modules that you may have, even if you purchased the new modules from Dell. If possible, do not pair an original memory module with a new memory module. Otherwise, your computer may not perform optimally.