Table 6-2 illustrates several sample memory configurations based on these guidelines.Table 6-2. Sample Memory Module ConfigurationsPerforming a Memory Upgrade1. Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").2. Remove the system cover.3. Remove the cooling shroud (see "Removing the Cooling Shroud").4. Locate the memory module sockets in which you will install or replace memory module pairs. Figure 6-9 shows the order of the memory module sockets.5. Install or replace the memory module pairs as necessary to reach the desired memory total (see "Installing Memory Modules" or "Removing MemoryModules").6. Install the cooling shroud (see "Installing the Cooling Shroud").7. Replace the system cover, reconnect the system to the electrical outlet, and turn on system. After the system completes the POST routine, it runs a memory test.The system detects that the new memory does not match the system configuration information, which is stored in NVRAM. The monitor displays an errormessage that ends with the following words:Total DesiredMemoryDIMM_A DIMM_B DIMM_C DIMM_D DIMM_E DIMM_F128 MB 64 MB 64 MB None None None None256 MB 128 MB 128 MB None None None None512 MB 256 MB 256 MB None None None None512 MB 128 MB 128 MB 128 MB 128 MB None None1 GB 256 MB 256 MB 256 MB 256 MB None None1.5 GB 256 MB 256 MB 256 MB 256 MB 256 MB 256 MB2 GB 512 MB 512 MB 512 MB 512 MB None None3 GB 512 MB 512 MB 512 MB 512 MB 512 MB 512 MB4 GB 1 GB 1 GB 1 GB 1 GB None NoneWARNING: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see"Safety First— For You and Your System" in "Troubleshooting Your System."CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document.