Dell External OEMR R710 Technical Manual

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Dell External OEMR R710 Technical Manual Manual pdf 32 page image

DellPowerEdge R710 Technical Guide 32The memory speed of each channel depends on the memory configuration: For single- or dual-rank memory modules:o One memory module per channel supports up to 1333 MHzo Two memory modules per channel support up to 1066 MHzo Three memory modules per channel are limited to 800 MHz, regardless of the memorymodule speed For quad-rank memory modules:o One memory module per channel supports up to 1066 MHzo Two memory modules per channel are limited to 800 MHz, regardless of memorymodule speedIf memory modules with different speeds are installed, they will operate at the speed of the slowestinstalled memory module(s).7.4 DIMM SlotsThe PowerEdge R710 has 18 DIMM slots for memory. It does not have any riser cards for DIMMpopulation.The first DIMM slot in each channel is color-coded with white ejection tabs for ease of installation.The DIMM sockets are placed 450 mils (11.43 mm) apart, center-to-center to provide enough spacefor sufficient airflow to cool stacked DIMMs.7.5 Low Voltage DIMMsWith the introduction of the Intel® Xeon® processor 5600 series, low voltage (LV) DIMMs have beenadded in selected memory configurations for the PowerEdge R710. Only this processor series supportsoperating DIMMs at the lower voltage (1.35V, also referred to as DDR3L). The Intel Xeon 5500processor series does not support low voltage operation. However, due to the backwards-compatiblenature of low voltage DIMMs, they can be operated at 1.5V. Therefore, DDR3L DIMMs can be used insystems with either processor series, and the platform will automatically choose the appropriateoperating voltage based on the processor populated. DDR3L DIMMs will be qualified and available foruse with Intel Xeon 5500 processor series mid-year 2011. Contact your Dell Sales Representative orvisit Dell.com for more information.LV DIMMs operate at 1.35V, creating power savings vs. standard memory which operates at 1.5V. Inorder to achieve power savings, all DIMMs in the system must be of the LV type. If the system detectsa mixture of standard and LV DIMMs, the BIOS will operate all memory at 1.5V. When operating atthe lower voltage, additional frequency and population restrictions can take effect. For example, 3DIMMs per channel operation is not supported at low voltage.The DDR3L standard is completely backwards-compatible at standard voltage. DDR3L DIMMs canoperate at 1.5V without any limitations beyond standard voltage DDR3 DIMMs. As part of the additionof LV DIMMs, the platform has certain default behaviors. Whenever possible, if there is noperformance degradation, the platform will default to 1.35V operation when using DDR3L DIMMs. Incertain cases, where a configuration is populated that cannot support 1.35V or a performancedegradation would result, the platform defaults to 1.5V operation. There are also options to overridedefault voltage within allowed limits.7.6 MirroringThe R710 system supports memory mirroring if identical memory modules are installed in the twochannels closest to the processor (memory not installed in the farthest channel). Mirroring must beenabled in the System Setup program. In a mirrored configuration, the total available systemmemory is one-half of the total installed physical memory.