IBM 425162U Installation And User Manual

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v Using ECC and non-ECC UDIMMs in the server will cause the server to run innon-ECC mode.v The UDIMM options that are available for the server are 1 GB, 2 GB, and 4 GBDIMMs.v You can install a maximum of 16 GB of memory in some server models whenyou use UDIMMs.v The server supports up to two single-rank or dual-rank UDIMMs per channel.v DIMM slots 3 and 6 are not supported when you install UDIMMs in the server.Do not install DIMMs in these connectors.v The following table lists the DIMM support compatibility.Table 4. Supported DIMM compatibilityDIMM configurationIntel quad-core(Xeon 3400 series)Intel dual-core (Corei3)Intel dual-core(Xeon L3406)UDIMM non-ECConlyNot supported Not supported Not supportedUDIMM ECC only Supported Supported SupportedUDIMM mix ECC withnon-ECCNot supported Not supported Not supportedRDIMM ECC only Supported Not supported Not supportedv The following table lists the supported UDIMM population.Table 5. Supported UDIMM population per channelDIMMconnectors perchannelDIMMs installedin each channel DIMM type DIMM speedRanks perDIMM (anycombination)2 1 UnbufferedDDR3 ECC1066, 1333 Single-rank,dual-rank2 2 UnbufferedDDR3 ECC1066, 1333 Single-rank,dual-rankv The following table lists the maximum DIMM population using ranked UDIMMs.Table 6. Maximum memory population using ranked UDIMMs (depending on your model)Number of UDIMMs DIMM type Size Total memory4 Single-rank UDIMMs 1 GB 4 GB4 Dual-rank UDIMMs 2 GB 8 GB4 Dual-rank UDIMMs 4 GB 16 GBv The following table shows the UDIMM memory population rule to optimize thesystem performance.Table 7. UDIMM population rule for dual-channel symmetric modeDIMMconnector 1DIMMconnector 2DIMMconnector 3DIMMconnector 4DIMMconnector 5DIMMconnector 6Populated Empty Empty Empty Empty EmptyPopulated Empty Empty Populated Empty EmptyPopulated Populated Empty Populated Populated Empty32 IBM System x3250 M3 Types 4251, 4252, and 4261: Installation and User’s Guide