Dell XPS 720 Black Owner's Manual - Page 91

- A pair of matched memory modules installed in DIMM connectors 1 and 2 and another matched pair installed in DIMM connectors 3 and 4 NOTICE: Do not install ECC memory modules. • If you install mixed pairs of PC2-5300 (DDR2 667-MHz) and PC2-6400 (DDR2 800-MHz) memory, the modules function at the speed of the slowest module installed. • Be sure to install a single memory module in DIMM connector 1, the connector closest to the processor, before you install modules in any other connector. . B A A matched pair of modules in DIMM connectors 1 B matched pair of memory modules in DIMM and 2 (white securing clips) connectors 3 and 4 (black securing clips) NOTICE: 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 start properly. You should install your original memory modules in pairs either in DIMM connectors 1 and 2 or DIMM connectors 3 and 4. NOTE: Memory purchased from Dell is covered under your computer warranty. Addressing Memory Configurations If you are using a 32-bit operating system such as Microsoft® Windows Vista™, your computer will support a maximum of 4 GB of memory. If you are using a 64-bit operating system, your computer will support a maximum of 8 GB (2-GB DIMMs in each of the four slots) of memory. Removing and Installing Parts 91