IBM System x3400 M3 Types 7378 Installation And User Manual

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Table 6. Maximum memory installation using ranked DIMMs (continued)Number of DIMMs DIMM type DIMM size Total memory16 Dual-rank RDIMMs 4 GB 64 GB16 Dual-rank RDIMMs 8 GB 128 GBv The RDIMM options that are available for the server are 1 GB, 2 GB, 4 GB, and8 GB. The server supports a minimum of 1 GB and a maximum of 128 GB ofsystem memory using RDIMMs.For 32-bit operating systems only: Some memory is reserved for varioussystem resources and is unavailable to the operating system. The amount ofmemory that is reserved for system resources depends on the operating system,the configuration of the server, and the configured PCI devices.v The UDIMM options that are available for the server are 1 GB, 2 GB and 4 GB.The server supports a minimum of 1 GB and a maximum of 48 GB of systemmemory using UDIMMs.Note: The amount of usable memory is reduced depending on the systemconfiguration. A certain amount of memory must be reserved for systemresources. To view the total amount of installed memory and the amount ofconfigured memory, run the Setup utility. For additional information, seeChapter 3, “Configuring the server,” on page 101.v When you install one quad-rank RDIMM in a channel, install it in the DIMMconnector furthest away from the microprocessor.v Do not install one quad-rank RDIMM in one channel and three RDIMMs inanother channel.v Do not install 1.5V DIMMs and 1.35V DIMMs in the same server.Installing the virtual media keyTo install a virtual media key, complete the following steps:1. Align the alignment bracket on the rear of the key with the retention tab on thesystem board; then, slide the key down into the virtual media key connector onthe system board until it is firmly seated in place.82 IBM System x3400 M3 Types 7378 and 7379: Installation and User's Guide