PC Hardware in a Nutshell, 3rd Edition

Testing and Configuring Newly Installed Memory

After you install the new memory modules and verify that all is as it should be, apply power to the system. The memory self-test should increment up to the newly installed amount of memory. If it instead shows only the original amount of memory, the cause is almost always that you have not seated the new memory module completely. Power down, reseat the module, and try again.

If the memory check shows an amount of memory larger than the original amount but smaller than the expected new amount, the problem is almost always that the BIOS and/or chipset do not support memory modules of the size you’ve installed. If that occurs, you may need to do one or more of the following things to resolve the problem:

• Check the Chipset Setup portion of CMOS Setup to determine how memory is configured for the newly installed bank(s). Most recent chipsets and BIOSs automatically determine the correct size and configuration parameters for installed modules. But some chipsets, BIOSs, and memory modules do not implement SPD correctly. If this occurs, you may have to set the correct size manually, if indeed the module size you have installed is an available option.

• A limitation on maximum module size may be enforced by the chipset, the BIOS, or both. Before deciding you cannot use the larger module, check the motherboard manufacturer’s web site for a BIOS update. If the restriction on module size is enforced by the BIOS but not by the chipset, you may find ...