IBM System x3550 M4 Product Manual

Also see for Redboks System x3550 M4: User guide Installation and user guide Installation and service guide Product guide

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IBM System x3550 M4 Product Manual Manual pdf 10 page image

IBM System x3550 M4 10Memory optionsIBM DDR3 memory is compatibility tested and tuned for optimal IBM System x® performance andthroughput. 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 x3550 M4 supports DDR3 memory. The server supports up to 12 DIMMs when oneprocessor is installed, and up to 24 DIMMs when two processors are installed. Each processor has fourmemory channels, and there are three DIMMs per channel. The following rules apply when selecting thememory configuration:Mixing different types of memory (UDIMMs, RDIMMs, and LRDIMMs) is not supported.zMixing 1.5 V and 1.35 V DIMMs in the same server is supported; in such cases, all DIMMs operate atz1.5 V.The maximum number of ranks supported per one channel is eight (with the exception of LoadzReduced DIMMs, where more than eight ranks are supported because one quad-rank LRDIMMprovides the same electrical load on a memory bus as a single-rank RDIMM).The maximum quantity of DIMMs that can be installed in server depends on number of CPUs, DIMMztype, rank, and operating voltage as shown in the "Max. quantity" row in Table 4.All DIMMs in all CPU memory channels operate at the same speed, which is determined as thezlowest value of:The memory speed supported by the specific CPU.zThe lowest of maximum operating speeds for the selected memory configuration that depends onzrated speed, operating voltage, and quantity of DIMMs per channel, as shown under "Maximumoperating speed" section in Table 4.Table 4. Maximum memory speedsSpecification UDIMMs RDIMMs LRDIMMsRank Dual rank Single rank Dual rank Quad rank Quad rankRated speed 1333 MHz 1333 MHz 1600MHz1333 MHz 1600MHz1066 MHz 1333 MHzRated voltage 1.35 V 1.35 V 1.5 V 1.35 V 1.5 V 1.35 V 1.35 VOperatingvoltage1.35 V 1.5 V 1.35 V 1.5 V 1.5 V 1.35 V 1.5 V 1.5 V 1.35 V 1.5 V 1.35 V 1.5 VMax quantity* 16 16 16 24 24 16 24 24 16 16 24 24Largest DIMM 4 GB 4 GB 4 GB 4 GB 4 GB 16 GB 16 GB 8 GB 8 GB 8 GB 32 GB 32 GBMax memorycapacity64 GB 64 GB 64 GB 96 GB 96 GB 256 GB 384 GB 192 GB 128 GB 128 GB 768 GB 768 GBMax memoryat max speed32 GB 64 GB 64 GB 64 GB 64 GB 256 GB 256 GB 128 GB 128 GB 64 GB 256 GB 512 GBMaximum operating speed (MHz)1 DIMMsper channel1333MHz1333MHz1333MHz1333MHz1600MHz1333MHz1333MHz1600MHz800MHz1066MHz1333MHz1333MHz2 DIMMsper channel1066MHz1333MHz1333MHz1333MHz1600MHz1333MHz1333MHz1600MHz800MHz800MHz1066MHz1333MHz3 DIMMsper channelNS** NS** NS** 1066MHz1066MHzNS** 1066MHz1066MHzNS** NS** 1066MHz1066MHz* Maximum quantity supported is shown for two processors installed. When one processor installed the maximumquantity supported is a half of shown.** NS = Not Supported