Dell GX280DT User Guide - Page 91

Back to Contents Page Memory Dell™ OptiPlex™ GX280 Systems User's Guide DDR2 Memory Overview Addressing Memory With 4-GB Configurations Replacing/Adding Additional Memory For information on the type of memory supported by your computer, look under "Memory" in "Specifications." NOTICE: Before you install new memory modules, download the most recent BIOS for your computer from the Dell Support website at support.dell.com. DDR2 Memory Overview l Dual-channel DDR2 memory modules should be installed in pairs of matched memory size, speed, and technology. If the DDR2 memory modules are not installed in matched pairs, the computer will continue to operate, but with a slight reduction in performance. See the label in the upper-right corner of the module to determine the module's capacity. NOTE: Always install DDR2 memory modules in the order indicated on the system board. The recommended memory configurations are: ¡ A memory module installed in connector DIMM1 or ¡ A pair of matched memory modules installed in connectors DIMM1 and DIMM2 or ¡ A pair of matched memory modules installed in connectors DIMM1 and DIMM2 and another matched pair installed in connectors DIMM3 and DIMM4 NOTICE: Do not install ECC memory modules. Doing so may cause the system not to boot or affect performance. Be sure to install a single memory module in DIMM1, the connector closest to the processor, before you install modules in the other connectors. NOTE: The small form-factor computer has two slots which are considered an interleaved pair. A matched pair of memory modules in connectors DIMM1 and DIMM2 (white securing clips) B matched pair of memory modules in connectors DIMM3 and DIMM4 (black securing clips) Addressing Memory With 4-GB Configurations The small-desktop, desktop, small mini-tower, and mini-tower computers support a maximum of 4 GB of memory when you use four 1-GB DIMMs. Current operating systems, such as Microsoft® Windows® 2000 and Windows XP, can only use a maximum of 4 GB of address space; however, the amount of memory available to the operating system is slightly less than 4 GB. Certain components within the computer require address space in the 4-GB range. Any address