Dell Inspiron 531S Owner's  Manual - Page 113

2 1 1 Pair A: matched pair of memory modules in connectors DIMM_1 and DIMM_2 2 Pair B: matched pair of memory modules in connectors DIMM_3 and DIMM_4 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. Installing Memory CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION: Before installing memory, you must remove the PCI Express x16 card. See "Cards" on page 116. NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis. Removing and Installing Parts 113