Dell External OEMR XL R610 Technical Manual

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Dell External OEMR XL R610 Technical Manual Manual pdf 30 page image

DellPowerEdge R610 Technical Guide 307.4 DIMM SlotsThe PowerEdge R610 has 12 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 for selected memory configurations for the PowerEdge R610. Only this processor seriessupports operating DIMMs at the lower voltage (1.35V, also referred to as DDR3L). The Intel Xeon5500 processor series does not support low voltage operation. However, due to the backwards-compatible nature of low voltage DIMMs, they can be operated at 1.5V. Therefore, DDR3L DIMMs canbe used in systems with either processor series, and the platform will automatically choose theappropriate operating voltage based on the processor populated. DDR3L DIMMs will be qualified andavailable for use with Intel Xeon 5500 processor series mid-year 2011. Contact your Dell SalesRepresentive or visit 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 R610 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.7.7 SparingSystems with the Intel Xeon processor 5600 series support memory sparing. Sparing requires identicalmemory installed in all three channels. One of the three channels is considered the Spare Channel,and two-thirds of the total installed memory is usable and is the amount reported during POST and inBIOS setup.