IBM System x3400 M3 Product Manual

Also see for System x3400 M3 Types 7378: Problem determination and service guide Brochure Installation and user guide Product guide Installation and user guide

Contents

IBM System x3400 M3 13Memory optionsIBM DDR3 memory is compatibility tested and tuned for optimal System x performance and throughput.IBM memory specifications are integrated into the light path diagnostics for immediate systemperformance feedback and optimum system uptime. From a service and support standpoint, IBM memoryautomatically assumes the IBM system warranty, and IBM provides service and support worldwide.The IBM System x3400 M3 supports DDR3 memory. The server supports up to eight DIMMs when oneprocessor is installed and up to 16 DIMMs when two processors are installed. However, the maximumnumber of DIMMs is limited by the number of ranks in the DIMMs:RDIMMsUp to 16 single-rank RDIMMs for a maximum of 64 GB (16x 4 GB)Up to 16 dual-rank RDIMMs for a maximum of 128 GB (16x 8 GB)UDIMMsUp to 16 single-rank UDIMMs for a maximum of 16 GB (16x 1 GB)Up to 16 dual-rank UDIMMs for a maximum of 64 GB (16x 4 GB)Each CPU has three memory channels, two of which contain three DIMMs per channel and the thirdcontains two DIMMs. RDIMMs can be populated up to three per channel. However, UDIMMs can only bepopulated two DIMMs per channel. That is, you can have up to 16 RDIMMs installed in the server, butonly up to 12 UDIMMs. Mixing UDIMMs and RDIMMs is not supported.Maximum memory speed is limited by memory speed supported by the specific CPU (that is, if the CPUonly supports 1066 MHz, then the memory speed cannot exceed 1066 MHz in any case) and by thenumber and type of DIMMs installed (whatever is lower), as follows:Intel Xeon 5600 series processors:1333 MHz when one or two single-rank or dual-rank RDIMMs per channel are installed or oneUDIMM per channel is installed1066 MHz when two UDIMMs per channel are installed800 MHz when three single-rank or dual-rank RDIMMs per channel are installedQuad-core Intel Xeon 5500 series processors:1333 MHz when one single-rank or dual-rank RDIMM per channel is installed or one UDIMM perchannel is installed1066 MHz when two single-rank or dual-rank RDIMMs per channel are installed, or two UDIMMsper channel are installed800 MHz when three single-rank or dual-rank RDIMMs per channel are installedDual-core Intel Xeon 5500 series processors only support memory speed at 800 MHz.The server supports both 1.5 V and 1.35 V DIMMs. Mixing 1.5 V and 1.35 V DIMMs in the same server issupported for Intel Xeon 5600 series processor-based systems. In such a case, all DIMMs operate at 1.5V. Intel Xeon 5500 series processor-based systems do not support 1.35 V DIMMs.The following memory protection technologies are supported:ECCChipKill (for x4-based RDIMMs)Memory mirroringMemory sparing